diff --git a/reference/array/functions/array-change-key-case.xml b/reference/array/functions/array-change-key-case.xml
index 64e78077bb..b9e5bd3a7d 100644
--- a/reference/array/functions/array-change-key-case.xml
+++ b/reference/array/functions/array-change-key-case.xml
@@ -11,7 +11,7 @@
   <methodsynopsis>
    <type>array</type><methodname>array_change_key_case</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>case</parameter><initializer>CASE_LOWER</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>case</parameter><initializer><constant>CASE_LOWER</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    Returns an array with all keys from <parameter>array</parameter> lowercased
@@ -101,7 +101,6 @@ Array
   </note>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-chunk.xml b/reference/array/functions/array-chunk.xml
index beadd5c452..21de0616d9 100644
--- a/reference/array/functions/array-chunk.xml
+++ b/reference/array/functions/array-chunk.xml
@@ -11,12 +11,12 @@
   <methodsynopsis>
    <type>array</type><methodname>array_chunk</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam><type>int</type><parameter>size</parameter></methodparam>
+   <methodparam><type>int</type><parameter>length</parameter></methodparam>
    <methodparam choice="opt"><type>bool</type><parameter>preserve_keys</parameter><initializer>&false;</initializer></methodparam>
   </methodsynopsis>
   <para>
-   Chunks an array into arrays with <parameter>size</parameter> elements.
-   The last chunk may contain less than <parameter>size</parameter> elements.
+   Chunks an array into arrays with <parameter>length</parameter> elements.
+   The last chunk may contain less than <parameter>length</parameter> elements.
   </para>
  </refsect1>
 
@@ -35,7 +35,7 @@
     </varlistentry>
 
     <varlistentry>
-     <term><parameter>size</parameter></term>
+     <term><parameter>length</parameter></term>
      <listitem>
       <para>
        The size of each chunk
@@ -61,14 +61,14 @@
   &reftitle.returnvalues;
   <para>
    Returns a multidimensional numerically indexed array, starting with zero,
-   with each dimension containing <parameter>size</parameter> elements.
+   with each dimension containing <parameter>length</parameter> elements.
   </para>
  </refsect1>
 
  <refsect1 role="errors">
   &reftitle.errors;
   <para>
-   If <parameter>size</parameter> is less than 1
+   If <parameter>length</parameter> is less than 1
    <constant>E_WARNING</constant> will be thrown and &null; returned.
   </para>
  </refsect1>
@@ -146,7 +146,6 @@ Array
  </refsect1>
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-column.xml b/reference/array/functions/array-column.xml
index 7cc90f8c0b..d777e1f2d6 100644
--- a/reference/array/functions/array-column.xml
+++ b/reference/array/functions/array-column.xml
@@ -9,13 +9,13 @@
   &reftitle.description;
   <methodsynopsis>
    <type>array</type><methodname>array_column</methodname>
-   <methodparam><type>array</type><parameter>input</parameter></methodparam>
-   <methodparam><type>mixed</type><parameter>column_key</parameter></methodparam>
-   <methodparam choice="opt"><type>mixed</type><parameter>index_key</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam><type>array</type><parameter>array</parameter></methodparam>
+   <methodparam><type class="union"><type>int</type><type>string</type><type>null</type></type><parameter>column_key</parameter></methodparam>
+   <methodparam choice="opt"><type class="union"><type>int</type><type>string</type><type>null</type></type><parameter>index_key</parameter><initializer>&null;</initializer></methodparam>
   </methodsynopsis>
   <para>
    <function>array_column</function> returns the values from a single column of
-   the <parameter>input</parameter>, identified by the
+   the <parameter>array</parameter>, identified by the
    <parameter>column_key</parameter>. Optionally, an
    <parameter>index_key</parameter> may be provided to index the values in the
    returned array by the values from the <parameter>index_key</parameter>
@@ -27,7 +27,7 @@
   <para>
    <variablelist>
     <varlistentry>
-     <term><parameter>input</parameter></term>
+     <term><parameter>array</parameter></term>
      <listitem>
       <para>
        A multi-dimensional array or an array of objects from which to pull a
@@ -87,7 +87,7 @@
       <row>
        <entry>7.0.0</entry>
        <entry>
-        Added the ability for the <parameter>input</parameter> parameter to be
+        Added the ability for the <parameter>array</parameter> parameter to be
         an array of objects.
        </entry>
       </row>
@@ -288,7 +288,6 @@ Array
  </refsect1> 
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
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 mode: sgml
diff --git a/reference/array/functions/array-fill.xml b/reference/array/functions/array-fill.xml
index 56378eeadf..2209ac7577 100644
--- a/reference/array/functions/array-fill.xml
+++ b/reference/array/functions/array-fill.xml
@@ -11,12 +11,12 @@
   <methodsynopsis>
    <type>array</type><methodname>array_fill</methodname>
    <methodparam><type>int</type><parameter>start_index</parameter></methodparam>
-   <methodparam><type>int</type><parameter>num</parameter></methodparam>
+   <methodparam><type>int</type><parameter>count</parameter></methodparam>
    <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
   </methodsynopsis>
   <para>
    Fills an array with
-   <parameter>num</parameter> entries of the value of the
+   <parameter>count</parameter> entries of the value of the
    <parameter>value</parameter> parameter, keys starting at the
    <parameter>start_index</parameter> parameter.
   </para>
@@ -44,7 +44,7 @@
     </varlistentry>
 
     <varlistentry>
-     <term><parameter>num</parameter></term>
+     <term><parameter>count</parameter></term>
      <listitem>
       <para>
        Number of elements to insert.
@@ -76,7 +76,7 @@
  <refsect1 role="errors">
   &reftitle.errors;
   <para>
-   Throws a <constant>E_WARNING</constant> if <parameter>num</parameter> is
+   Throws a <constant>E_WARNING</constant> if <parameter>count</parameter> is
    less than zero.
   </para>
  </refsect1>
@@ -96,8 +96,8 @@
       <row>
        <entry>5.6.0</entry>
        <entry>
-        <parameter>num</parameter> may now be zero. Previously,
-        <parameter>num</parameter> was required to be greater than zero.
+        <parameter>count</parameter> may now be zero. Previously,
+        <parameter>count</parameter> was required to be greater than zero.
        </entry>
       </row>
      </tbody>
@@ -166,7 +166,6 @@ Array
  </refsect1>
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-filter.xml b/reference/array/functions/array-filter.xml
index a34af7749a..5a84b90c3d 100644
--- a/reference/array/functions/array-filter.xml
+++ b/reference/array/functions/array-filter.xml
@@ -11,8 +11,8 @@
   <methodsynopsis>
    <type>array</type><methodname>array_filter</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam choice="opt"><type>callable</type><parameter>callback</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>flag</parameter><initializer>0</initializer></methodparam>
+   <methodparam choice="opt"><type class="union"><type>callable</type><type>null</type></type><parameter>callback</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>0</initializer></methodparam>
   </methodsynopsis>
   <para>
    Iterates over each value in the <parameter>array</parameter>
@@ -56,7 +56,7 @@
     </varlistentry>
 
     <varlistentry>
-     <term><parameter>flag</parameter></term>
+     <term><parameter>mode</parameter></term>
      <listitem>
       <para>
        Flag determining what arguments are sent to <parameter>callback</parameter>:
@@ -98,10 +98,16 @@
      </row>
     </thead>
     <tbody>
+     <row>
+      <entry>8.0.0</entry>
+      <entry>
+       <parameter>callback</parameter> is nullable now.
+      </entry>
+     </row>
      <row>
       <entry>5.6.0</entry>
       <entry>
-       Added optional <parameter>flag</parameter> parameter and constants 
+       Added optional <parameter>mode</parameter> parameter and constants 
        <constant>ARRAY_FILTER_USE_KEY</constant> and 
        <constant>ARRAY_FILTER_USE_BOTH</constant>
       </entry>
@@ -203,7 +209,7 @@ Array
    </example>
    <example>
     <title><function>array_filter</function> with 
-    <parameter>flag</parameter></title>
+    <parameter>mode</parameter></title>
     <programlisting role="php">
 <![CDATA[
 <?php
@@ -261,7 +267,6 @@ array(2) {
  </refsect1>
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-key-exists.xml b/reference/array/functions/array-key-exists.xml
index 46b5c22763..f458eccb24 100644
--- a/reference/array/functions/array-key-exists.xml
+++ b/reference/array/functions/array-key-exists.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-key-exists">
+<refentry xml:id="function.array-key-exists" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>array_key_exists</refname>
   <refpurpose>Checks if the given key or index exists in the array</refpurpose>
@@ -10,7 +10,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>bool</type><methodname>array_key_exists</methodname>
-   <methodparam><type>mixed</type><parameter>key</parameter></methodparam>
+   <methodparam><type class="union"><type>string</type><type>int</type></type><parameter>key</parameter></methodparam>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
   </methodsynopsis>
   <para>
@@ -128,7 +128,6 @@ array_key_exists('first', $search_array);
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-key-first.xml b/reference/array/functions/array-key-first.xml
index 3095e6b85c..85f8ea4288 100644
--- a/reference/array/functions/array-key-first.xml
+++ b/reference/array/functions/array-key-first.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-
 <refentry xml:id="function.array-key-first" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
   <refname>array_key_first</refname>
@@ -10,7 +9,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>array_key_first</methodname>
+   <type class="union"><type>int</type><type>string</type><type>null</type></type><methodname>array_key_first</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
   </methodsynopsis>
   <para>
@@ -105,7 +104,6 @@ if (!function_exists('array_key_first')) {
  </refsect1>
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-key-last.xml b/reference/array/functions/array-key-last.xml
index e6ab8d099d..8137e78fe1 100644
--- a/reference/array/functions/array-key-last.xml
+++ b/reference/array/functions/array-key-last.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-
 <refentry xml:id="function.array-key-last" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
   <refname>array_key_last</refname>
@@ -10,7 +9,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>array_key_last</methodname>
+   <type class="union"><type>int</type><type>string</type><type>null</type></type><methodname>array_key_last</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
   </methodsynopsis>
   <para>
@@ -50,7 +49,6 @@
  </refsect1>
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-map.xml b/reference/array/functions/array-map.xml
index ca6ece8c4e..7c9ac5bbdd 100644
--- a/reference/array/functions/array-map.xml
+++ b/reference/array/functions/array-map.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-map">
+<refentry xml:id="function.array-map" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>array_map</refname>
   <refpurpose>Applies the callback to the elements of the given arrays</refpurpose>
@@ -10,7 +10,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>array</type><methodname>array_map</methodname>
-   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
+   <methodparam><type class="union"><type>callable</type><type>null</type></type><parameter>callback</parameter></methodparam>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
    <methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
   </methodsynopsis>
@@ -388,7 +388,6 @@ array(1) {
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-pad.xml b/reference/array/functions/array-pad.xml
index 15e044b01e..ff2483f4db 100644
--- a/reference/array/functions/array-pad.xml
+++ b/reference/array/functions/array-pad.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-pad">
+<refentry xml:id="function.array-pad" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>array_pad</refname>
   <refpurpose>Pad array to the specified length with a value</refpurpose>
@@ -11,17 +11,17 @@
   <methodsynopsis>
    <type>array</type><methodname>array_pad</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam><type>int</type><parameter>size</parameter></methodparam>
+   <methodparam><type>int</type><parameter>length</parameter></methodparam>
    <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>array_pad</function> returns a copy of the
    <parameter>array</parameter> padded to size specified by
-   <parameter>size</parameter> with value
+   <parameter>length</parameter> with value
    <parameter>value</parameter>. If
-   <parameter>size</parameter> is positive then the array is
+   <parameter>length</parameter> is positive then the array is
    padded on the right, if it's negative then on the left. If the
-   absolute value of <parameter>size</parameter> is less than or
+   absolute value of <parameter>length</parameter> is less than or
    equal to the length of the <parameter>array</parameter> then no
    padding takes place.
    It is possible to add at most 1048576 elements at a time.
@@ -41,7 +41,7 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>size</parameter></term>
+     <term><parameter>length</parameter></term>
      <listitem>
       <para>
        New size of the array.
@@ -53,7 +53,7 @@
      <listitem>
       <para>
        Value to pad if <parameter>array</parameter> is less than
-       <parameter>size</parameter>.
+       <parameter>length</parameter>.
       </para>
      </listitem>
     </varlistentry>
@@ -65,10 +65,10 @@
   &reftitle.returnvalues;
   <para>
    Returns a copy of the <parameter>array</parameter> padded to size specified
-   by <parameter>size</parameter> with value 
-   <parameter>value</parameter>. If <parameter>size</parameter> is 
+   by <parameter>length</parameter> with value 
+   <parameter>value</parameter>. If <parameter>length</parameter> is 
    positive then the array is padded on the right, if it's negative then 
-   on the left. If the absolute value of <parameter>size</parameter> is less
+   on the left. If the absolute value of <parameter>length</parameter> is less
    than or equal to the length of the <parameter>array</parameter> then no
    padding takes place.
   </para>
@@ -108,7 +108,6 @@ $result = array_pad($input, 2, "noop");
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-rand.xml b/reference/array/functions/array-rand.xml
index 912acb9a5e..ce1d2bd66e 100644
--- a/reference/array/functions/array-rand.xml
+++ b/reference/array/functions/array-rand.xml
@@ -8,7 +8,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>array_rand</methodname>
+   <type class="union"><type>int</type><type>string</type><type>array</type></type><methodname>array_rand</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
    <methodparam choice="opt"><type>int</type><parameter>num</parameter><initializer>1</initializer></methodparam>
   </methodsynopsis>
@@ -105,7 +105,6 @@ echo $input[$rand_keys[1]] . "\n";
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
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 mode: sgml
diff --git a/reference/array/functions/array-replace-recursive.xml b/reference/array/functions/array-replace-recursive.xml
index 7821cd3629..18e6aa0ffb 100644
--- a/reference/array/functions/array-replace-recursive.xml
+++ b/reference/array/functions/array-replace-recursive.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>array</type><methodname>array_replace_recursive</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam choice="opt"><type>array</type><parameter>replacements</parameter></methodparam>
+   <methodparam rep="repeat"><type>array</type><parameter>replacements</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>array_replace_recursive</function> replaces the values of
@@ -164,7 +164,6 @@ Array
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
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 mode: sgml
diff --git a/reference/array/functions/array-replace.xml b/reference/array/functions/array-replace.xml
index 60ba91c790..67549459a1 100644
--- a/reference/array/functions/array-replace.xml
+++ b/reference/array/functions/array-replace.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>array</type><methodname>array_replace</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam choice="opt"><type>array</type><parameter>replacements</parameter></methodparam>
+   <methodparam rep="repeat"><type>array</type><parameter>replacements</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>array_replace</function> replaces the values of
@@ -100,7 +100,6 @@ Array
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
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 mode: sgml
diff --git a/reference/array/functions/array-search.xml b/reference/array/functions/array-search.xml
index 6823ce0553..8b9c5385c6 100644
--- a/reference/array/functions/array-search.xml
+++ b/reference/array/functions/array-search.xml
@@ -8,7 +8,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>array_search</methodname>
+   <type class="union"><type>int</type><type>string</type><type>false</type></type><methodname>array_search</methodname>
    <methodparam><type>mixed</type><parameter>needle</parameter></methodparam>
    <methodparam><type>array</type><parameter>haystack</parameter></methodparam>
    <methodparam choice="opt"><type>bool</type><parameter>strict</parameter><initializer>&false;</initializer></methodparam>
@@ -104,7 +104,6 @@ $key = array_search('red', $array);   // $key = 1;
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-slice.xml b/reference/array/functions/array-slice.xml
index 7348ae023b..e2771e9881 100644
--- a/reference/array/functions/array-slice.xml
+++ b/reference/array/functions/array-slice.xml
@@ -11,7 +11,7 @@
    <type>array</type><methodname>array_slice</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
    <methodparam><type>int</type><parameter>offset</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
    <methodparam choice="opt"><type>bool</type><parameter>preserve_keys</parameter><initializer>&false;</initializer></methodparam>
   </methodsynopsis>
   <para>
@@ -200,7 +200,6 @@ Array
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
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 mode: sgml
diff --git a/reference/array/functions/array-splice.xml b/reference/array/functions/array-splice.xml
index 0f9d3310ba..318a854d7f 100644
--- a/reference/array/functions/array-splice.xml
+++ b/reference/array/functions/array-splice.xml
@@ -9,20 +9,20 @@
   &reftitle.description;
   <methodsynopsis>
    <type>array</type><methodname>array_splice</methodname>
-   <methodparam><type>array</type><parameter role="reference">input</parameter></methodparam>
+   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
    <methodparam><type>int</type><parameter>offset</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>count($input)</initializer></methodparam>
-   <methodparam choice="opt"><type>mixed</type><parameter>replacement</parameter><initializer>array()</initializer></methodparam>
+   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type>mixed</type><parameter>replacement</parameter><initializer>[]</initializer></methodparam>
   </methodsynopsis>
   <para>
    Removes the elements designated by <parameter>offset</parameter> and
-   <parameter>length</parameter> from the <parameter>input</parameter> array,
+   <parameter>length</parameter> from the <parameter>array</parameter> array,
    and replaces them with the elements of the
    <parameter>replacement</parameter> array, if supplied.
   </para>
   <note>
    <para>
-    Numerical keys in <parameter>input</parameter> are not preserved.
+    Numerical keys in <parameter>array</parameter> are not preserved.
    </para>
   </note>
   <note>
@@ -39,7 +39,7 @@
   <para>
    <variablelist>
     <varlistentry>
-     <term><parameter>input</parameter></term>
+     <term><parameter>array</parameter></term>
      <listitem>
       <para>
        The input array.
@@ -52,12 +52,12 @@
       <para>
        If <parameter>offset</parameter> is positive then the start of the
        removed portion is at that offset from the beginning of the
-       <parameter>input</parameter> array.
+       <parameter>array</parameter> array.
       </para>
       <para>
        If <parameter>offset</parameter> is negative then the start of the
        removed portion is at that offset from the end of the
-       <parameter>input</parameter> array.
+       <parameter>array</parameter> array.
       </para>
      </listitem>
     </varlistentry>
@@ -124,6 +124,29 @@
    Returns an array consisting of the extracted elements.
   </para>
  </refsect1>
+
+ <refsect1 role="changelog">
+  &reftitle.changelog;
+  <informaltable>
+   <tgroup cols="2">
+    <thead>
+     <row>
+      <entry>&Version;</entry>
+      <entry>&Description;</entry>
+     </row>
+    </thead>
+    <tbody>
+     <row>
+      <entry>8.0.0</entry>
+      <entry>
+       <parameter>length</parameter> is nullable now.
+      </entry>
+     </row>
+    </tbody>
+   </tgroup>
+  </informaltable>
+ </refsect1>
+
  <refsect1 role="examples">
   &reftitle.examples;
   <para>
@@ -234,7 +257,6 @@ array_splice($input, $x, 1, $y);
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/array-unique.xml b/reference/array/functions/array-unique.xml
index 48f1435ce7..2d55489811 100644
--- a/reference/array/functions/array-unique.xml
+++ b/reference/array/functions/array-unique.xml
@@ -11,7 +11,7 @@
   <methodsynopsis>
    <type>array</type><methodname>array_unique</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_STRING</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_STRING</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    Takes an input <parameter>array</parameter> and returns a new array
@@ -19,7 +19,7 @@
   </para>
   <para>
    Note that keys are preserved. If multiple elements compare equal under
-   the given <parameter>sort_flags</parameter>, then the key and value of
+   the given <parameter>flags</parameter>, then the key and value of
    the first equal element will be retained.
   </para>
   <note>
@@ -44,10 +44,10 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
-       The optional second parameter <parameter>sort_flags</parameter>
+       The optional second parameter <parameter>flags</parameter>
        may be used to modify the sorting behavior using these values:
       </para>
       <para>
@@ -98,7 +98,7 @@
       <row>
        <entry>7.2.0</entry>
        <entry>
-        If <parameter>sort_flags</parameter> is <constant>SORT_STRING</constant>,
+        If <parameter>flags</parameter> is <constant>SORT_STRING</constant>,
         formerly <parameter>array</parameter> has been copied and non-unique
         elements have been removed (without packing the array afterwards), but
         now a new array is built by adding the unique elements. This can result
@@ -183,7 +183,6 @@ array(2) {
  </refsect1>
 
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/arsort.xml b/reference/array/functions/arsort.xml
index 773216f58e..3aa98bab9a 100644
--- a/reference/array/functions/arsort.xml
+++ b/reference/array/functions/arsort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>arsort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_REGULAR</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    This function sorts an array such that array indices maintain their
@@ -35,11 +35,11 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
        You may modify the behavior of the sort using the optional parameter
-       <parameter>sort_flags</parameter>, for details see
+       <parameter>flags</parameter>, for details see
        <function>sort</function>.
       </para>
      </listitem>
@@ -95,7 +95,6 @@ c = apple
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/asort.xml b/reference/array/functions/asort.xml
index e5794ca055..8fbd20b35f 100644
--- a/reference/array/functions/asort.xml
+++ b/reference/array/functions/asort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>asort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_REGULAR</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    This function sorts an array such that array indices maintain
@@ -33,11 +33,11 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
        You may modify the behavior of the sort using the optional
-       parameter <parameter>sort_flags</parameter>, for details
+       parameter <parameter>flags</parameter>, for details
        see <function>sort</function>.
       </para>
      </listitem>
@@ -93,7 +93,6 @@ a = orange
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/compact.xml b/reference/array/functions/compact.xml
index 5522a1946a..288c4238ad 100644
--- a/reference/array/functions/compact.xml
+++ b/reference/array/functions/compact.xml
@@ -9,8 +9,8 @@
   &reftitle.description;
   <methodsynopsis>
    <type>array</type><methodname>compact</methodname>
-   <methodparam><type>mixed</type><parameter>var_name</parameter></methodparam>
-   <methodparam rep="repeat"><type>mixed</type><parameter>var_names</parameter></methodparam>
+   <methodparam><type class="union"><type>array</type><type>string</type></type><parameter>var_name</parameter></methodparam>
+   <methodparam rep="repeat"><type class="union"><type>array</type><type>string</type></type><parameter>var_names</parameter></methodparam>
   </methodsynopsis>
   <para>
    Creates an array containing variables and their values.
@@ -141,7 +141,6 @@ Array
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/count.xml b/reference/array/functions/count.xml
index ab8e236e52..3e9c1f4f7e 100644
--- a/reference/array/functions/count.xml
+++ b/reference/array/functions/count.xml
@@ -9,8 +9,8 @@
   &reftitle.description;
   <methodsynopsis>
    <type>int</type><methodname>count</methodname>
-   <methodparam><type>mixed</type><parameter>array_or_countable</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>COUNT_NORMAL</initializer></methodparam>
+   <methodparam><type class="union"><type>Countable</type><type>array</type></type><parameter>value</parameter></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>COUNT_NORMAL</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    Counts all elements in an array, or something in an object.
@@ -34,7 +34,7 @@
   <para>
    <variablelist>
     <varlistentry>
-     <term><parameter>array_or_countable</parameter></term>
+     <term><parameter>value</parameter></term>
      <listitem>
       <para>
        An array or <classname>Countable</classname> object.
@@ -66,11 +66,11 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Returns the number of elements in <parameter>array_or_countable</parameter>.
+   Returns the number of elements in <parameter>value</parameter>.
    When the parameter is neither an array nor an object with
    implemented <classname>Countable</classname> interface,
    <literal>1</literal> will be returned.
-   There is one exception, if <parameter>array_or_countable</parameter> is &null;,
+   There is one exception, if <parameter>value</parameter> is &null;,
    <literal>0</literal> will be returned.
   </para>
  </refsect1>
@@ -149,7 +149,7 @@ echo count($food); // output 2
       <entry>7.2.0</entry>
       <entry>
        <function>count</function> will now yield a warning on invalid countable types 
-       passed to the <parameter>array_or_countable</parameter> parameter.
+       passed to the <parameter>value</parameter> parameter.
       </entry>
      </row>
     </tbody>
@@ -169,7 +169,6 @@ echo count($food); // output 2
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/current.xml b/reference/array/functions/current.xml
index bdd5bde015..02bfd3f31a 100644
--- a/reference/array/functions/current.xml
+++ b/reference/array/functions/current.xml
@@ -9,7 +9,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>mixed</type><methodname>current</methodname>
-   <methodparam><type>array</type><parameter>array</parameter></methodparam>
+   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter>array</parameter></methodparam>
   </methodsynopsis>
   <para>
    Every array has an internal pointer to its "current" element,
@@ -127,7 +127,6 @@ var_dump(current($arr)); // array(0) { }
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/end.xml b/reference/array/functions/end.xml
index d65e1a88ad..fc3efbc2f0 100644
--- a/reference/array/functions/end.xml
+++ b/reference/array/functions/end.xml
@@ -9,7 +9,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>mixed</type><methodname>end</methodname>
-   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
+   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter role="reference">array</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>end</function> advances <parameter>array</parameter>'s
@@ -72,7 +72,6 @@ echo end($fruits); // cranberry
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/extract.xml b/reference/array/functions/extract.xml
index e824bf688f..23091c2508 100644
--- a/reference/array/functions/extract.xml
+++ b/reference/array/functions/extract.xml
@@ -10,8 +10,8 @@
   <methodsynopsis>
    <type>int</type><methodname>extract</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>EXTR_OVERWRITE</initializer></methodparam>
-   <methodparam choice="opt"><type>string</type><parameter>prefix</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>EXTR_OVERWRITE</constant></initializer></methodparam>
+   <methodparam choice="opt"><type>string</type><parameter>prefix</parameter><initializer>""</initializer></methodparam>
   </methodsynopsis>
   <para>
    Import variables from an array into the current symbol table.
@@ -323,7 +323,6 @@ string(1) "/"
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/key.xml b/reference/array/functions/key.xml
index 60cd1049e7..b62cc5327a 100644
--- a/reference/array/functions/key.xml
+++ b/reference/array/functions/key.xml
@@ -9,8 +9,8 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>key</methodname>
-   <methodparam><type>array</type><parameter>array</parameter></methodparam>
+   <type class="union"><type>int</type><type>string</type><type>null</type></type><methodname>key</methodname>
+   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter>array</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>key</function> returns the index element of the current array
@@ -115,7 +115,6 @@ fruit5<br />
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/krsort.xml b/reference/array/functions/krsort.xml
index 60b4b1fbe8..e96a41d728 100644
--- a/reference/array/functions/krsort.xml
+++ b/reference/array/functions/krsort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>krsort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_REGULAR</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    Sorts an array by key in reverse order, maintaining key to data
@@ -30,11 +30,11 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
        You may modify the behavior of the sort using the optional parameter
-       <parameter>sort_flags</parameter>, for details see
+       <parameter>flags</parameter>, for details see
        <function>sort</function>.
       </para>
      </listitem>
@@ -87,7 +87,6 @@ a = orange
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/ksort.xml b/reference/array/functions/ksort.xml
index 4978c842c4..d4dd7fbe46 100644
--- a/reference/array/functions/ksort.xml
+++ b/reference/array/functions/ksort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>ksort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_REGULAR</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    Sorts an array by key, maintaining key to data correlations. This is
@@ -30,11 +30,11 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
        You may modify the behavior of the sort using the optional
-       parameter <parameter>sort_flags</parameter>, for details
+       parameter <parameter>flags</parameter>, for details
        see <function>sort</function>.
       </para>
      </listitem>
@@ -86,7 +86,6 @@ d = lemon
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/next.xml b/reference/array/functions/next.xml
index 7a3d919908..def326872c 100644
--- a/reference/array/functions/next.xml
+++ b/reference/array/functions/next.xml
@@ -9,7 +9,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>mixed</type><methodname>next</methodname>
-   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
+   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter role="reference">array</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>next</function> behaves like
@@ -94,7 +94,6 @@ $mode = end($transport);     // $mode = 'plane';
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/prev.xml b/reference/array/functions/prev.xml
index d6c1eab3e1..2942651320 100644
--- a/reference/array/functions/prev.xml
+++ b/reference/array/functions/prev.xml
@@ -9,7 +9,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>mixed</type><methodname>prev</methodname>
-   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
+   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter role="reference">array</parameter></methodparam>
   </methodsynopsis>
   <para>
    Rewind the internal array pointer.
@@ -87,7 +87,6 @@ $mode = end($transport);     // $mode = 'plane';
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/range.xml b/reference/array/functions/range.xml
index de7ebf4263..58ed2f2890 100644
--- a/reference/array/functions/range.xml
+++ b/reference/array/functions/range.xml
@@ -9,8 +9,8 @@
   &reftitle.description;
   <methodsynopsis>
    <type>array</type><methodname>range</methodname>
-   <methodparam><type>mixed</type><parameter>start</parameter></methodparam>
-   <methodparam><type>mixed</type><parameter>end</parameter></methodparam>
+   <methodparam><type class="union"><type>string</type><type>int</type><type>float</type></type><parameter>start</parameter></methodparam>
+   <methodparam><type class="union"><type>string</type><type>int</type><type>float</type></type><parameter>end</parameter></methodparam>
    <methodparam choice="opt"><type class="union"><type>int</type><type>float</type></type><parameter>step</parameter><initializer>1</initializer></methodparam>
   </methodsynopsis>
   <para>
@@ -113,7 +113,6 @@ foreach (range('c', 'a') as $letter) {
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/reset.xml b/reference/array/functions/reset.xml
index f303ae1900..4bef97596a 100644
--- a/reference/array/functions/reset.xml
+++ b/reference/array/functions/reset.xml
@@ -9,7 +9,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>mixed</type><methodname>reset</methodname>
-   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
+   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter role="reference">array</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>reset</function> rewinds <parameter>array</parameter>'s internal
@@ -96,7 +96,6 @@ echo current($array) . "<br />\n"; // "step one"
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/rsort.xml b/reference/array/functions/rsort.xml
index 961df7e0d7..6116e0aeca 100644
--- a/reference/array/functions/rsort.xml
+++ b/reference/array/functions/rsort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>rsort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_REGULAR</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    This function sorts an array in reverse order (highest to lowest).
@@ -30,11 +30,11 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
        You may modify the behavior of the sort using the optional
-       parameter <parameter>sort_flags</parameter>, for details see
+       parameter <parameter>flags</parameter>, for details see
        <function>sort</function>.
       </para>
      </listitem>
@@ -94,7 +94,6 @@ foreach ($fruits as $key => $val) {
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/sort.xml b/reference/array/functions/sort.xml
index abc6aa4663..2bf11fa9ee 100644
--- a/reference/array/functions/sort.xml
+++ b/reference/array/functions/sort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>sort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>sort_flags</parameter><initializer>SORT_REGULAR</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
   </methodsynopsis>
   <para>
    This function sorts an array.  Elements will be arranged from
@@ -31,10 +31,10 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>sort_flags</parameter></term>
+     <term><parameter>flags</parameter></term>
      <listitem>
       <para>
-       The optional second parameter <parameter>sort_flags</parameter>
+       The optional second parameter <parameter>flags</parameter>
        may be used to modify the sorting behavior using these values:
       </para>
       <para>
@@ -167,7 +167,7 @@ fruits[3] = orange20
    <simpara>
     Be careful when sorting arrays with mixed types values because
     <function>sort</function> can produce unexpected results,
-    if <parameter>sort_flags</parameter> is <constant>SORT_REGULAR</constant>,
+    if <parameter>flags</parameter> is <constant>SORT_REGULAR</constant>,
    </simpara>
   </warning>
  </refsect1>
@@ -182,7 +182,6 @@ fruits[3] = orange20
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/uasort.xml b/reference/array/functions/uasort.xml
index 769588fa54..abcebea784 100644
--- a/reference/array/functions/uasort.xml
+++ b/reference/array/functions/uasort.xml
@@ -11,7 +11,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>uasort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam><type>callable</type><parameter>value_compare_func</parameter></methodparam>
+   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
   </methodsynopsis>
   <para>
    This function sorts an array such that array indices maintain their
@@ -38,7 +38,7 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>value_compare_func</parameter></term>
+     <term><parameter>callback</parameter></term>
      <listitem>
       <para>
        See <function>usort</function> and <function>uksort</function> for
@@ -124,7 +124,6 @@ Array
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/uksort.xml b/reference/array/functions/uksort.xml
index 3b80f0797d..22733a9908 100644
--- a/reference/array/functions/uksort.xml
+++ b/reference/array/functions/uksort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>uksort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam><type>callable</type><parameter>key_compare_func</parameter></methodparam>
+   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
   </methodsynopsis>
   <para>
    <function>uksort</function> will sort the keys of an array using a
@@ -33,7 +33,7 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>key_compare_func</parameter></term>
+     <term><parameter>callback</parameter></term>
      <listitem>
       <para>
        &return.callbacksort;
@@ -97,7 +97,6 @@ John: 1
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml
diff --git a/reference/array/functions/usort.xml b/reference/array/functions/usort.xml
index 33e5f0faf9..808ba9459e 100644
--- a/reference/array/functions/usort.xml
+++ b/reference/array/functions/usort.xml
@@ -10,7 +10,7 @@
   <methodsynopsis>
    <type>bool</type><methodname>usort</methodname>
    <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
-   <methodparam><type>callable</type><parameter>value_compare_func</parameter></methodparam>
+   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
   </methodsynopsis>
   <para>
    This function will sort an array by its values using a user-supplied
@@ -33,7 +33,7 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>value_compare_func</parameter></term>
+     <term><parameter>callback</parameter></term>
      <listitem>
       <para>
        &return.callbacksort;
@@ -238,7 +238,6 @@ z, c
   </para>
  </refsect1>
 </refentry>
-
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml