diff --git a/reference/array/functions/array-diff-uassoc.xml b/reference/array/functions/array-diff-uassoc.xml
index 348733b00a..3b4e4c9f3f 100644
--- a/reference/array/functions/array-diff-uassoc.xml
+++ b/reference/array/functions/array-diff-uassoc.xml
@@ -62,11 +62,9 @@
      <term><parameter>key_compare_func</parameter></term>
      <listitem>
       <para>
-       <type>callback</type> function to use.
-       The callback function must return an integer less than, equal
-       to, or greater than zero if the first argument is considered to
-       be respectively less than, equal to, or greater than the second.
+       &return.callbacksort;
       </para>
+      &callback.cmp;
      </listitem>
     </varlistentry>
 
diff --git a/reference/array/functions/array-diff-ukey.xml b/reference/array/functions/array-diff-ukey.xml
index 31d639a215..d0960b3022 100644
--- a/reference/array/functions/array-diff-ukey.xml
+++ b/reference/array/functions/array-diff-ukey.xml
@@ -63,11 +63,9 @@
      <term><parameter>key_compare_func</parameter></term>
      <listitem>
       <para>
-       <type>callback</type> function to use.
-       The callback function must return an integer less than, equal
-       to, or greater than zero if the first argument is considered to
-       be respectively less than, equal to, or greater than the second.
+       &return.callbacksort;
       </para>
+      &callback.cmp;
      </listitem>
     </varlistentry>
 
diff --git a/reference/array/functions/array-udiff.xml b/reference/array/functions/array-udiff.xml
index 81e6a8a77c..d5dedec406 100644
--- a/reference/array/functions/array-udiff.xml
+++ b/reference/array/functions/array-udiff.xml
@@ -47,11 +47,9 @@
        The callback comparison function.
       </para>
       <para>
-       The user supplied callback function is used for comparison.
-       It must return an integer less than, equal to, or greater than zero if
-       the first argument is considered to be respectively less than, equal
-       to, or greater than the second.
+       &return.callbacksort;
       </para>
+      &callback.cmp;
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/reference/array/functions/array-uintersect-assoc.xml b/reference/array/functions/array-uintersect-assoc.xml
index 3f0c30bc1d..64394401ab 100644
--- a/reference/array/functions/array-uintersect-assoc.xml
+++ b/reference/array/functions/array-uintersect-assoc.xml
@@ -48,12 +48,9 @@
      <term><parameter>data_compare_func</parameter></term>
      <listitem>
       <para>
-       For comparison is used the user supplied callback function.
-       It must return an integer less than, equal
-       to, or greater than zero if the first argument is considered to
-       be respectively less than, equal to, or greater than the
-       second.
+       &return.callbacksort;
       </para>
+      &callback.cmp;
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/reference/array/functions/array-uintersect-uassoc.xml b/reference/array/functions/array-uintersect-uassoc.xml
index c742663d71..8d35ae9f45 100644
--- a/reference/array/functions/array-uintersect-uassoc.xml
+++ b/reference/array/functions/array-uintersect-uassoc.xml
@@ -46,12 +46,9 @@
      <term><parameter>data_compare_func</parameter></term>
      <listitem>
       <para>
-       For comparison is used the user supplied callback function.
-       It must return an integer less than, equal
-       to, or greater than zero if the first argument is considered to
-       be respectively less than, equal to, or greater than the
-       second.
+       &return.callbacksort;
       </para>
+      &callback.cmp;
      </listitem>
     </varlistentry>
     <varlistentry>