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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-intersect-ukey">
 <refnamediv>
  <refname>array_intersect_ukey</refname>
  <refpurpose>Computes the intersection of arrays using a callback function on the keys for comparison</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_intersect_ukey</methodname>
   <methodparam><type>array</type><parameter>array1</parameter></methodparam>
   <methodparam><type>array</type><parameter>array2</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>...</parameter></methodparam>
   <methodparam><type>callback</type><parameter>key_compare_func</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>array_intersect_ukey</function> returns an array
   containing all the values of <parameter>array1</parameter>
   which have matching keys that are present in all the arguments.
  </para>
  <para>
   This comparison is done by a user supplied callback function.
   It must return an integer less than, equal to, or greater than zero if the
   first key is considered to be respectively less than, equal to, or
   greater than the second.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array1</parameter></term>
     <listitem>
      <para>
       Initial array for comparision of the arrays.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>array2</parameter></term>
     <listitem>
      <para>
       First array to compare keys against.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       Variable list of array arguments to compare keys against.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>key_compare_func</parameter></term>
     <listitem>
      <para>
       User supplied callback function to do the comparision.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the values of <parameter>array1</parameter> whose keys exist
   in all the arguments.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_intersect_ukey</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
function key_compare_func($key1, $key2)
{
    if ($key1 == $key2)
        return 0;
    else if ($key1 > $key2)
        return 1;
    else
        return -1;
}

$array1 = array('blue'  => 1, 'red'  => 2, 'green'  => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'   => 8);

var_dump(array_intersect_ukey($array1, $array2, 'key_compare_func'));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}
]]>
    </screen>
   </example>
  </para>
  <para>
   In our example you see that only the keys <literal>'blue'</literal>
   and <literal>'green'</literal> are present in both arrays and thus
   returned. Also notice that the values for the keys
   <literal>'blue'</literal> and <literal>'green'</literal> differ between
   the two arrays. A match still occurs because only the keys are checked.
   The values returned are those of <parameter>array1</parameter>.
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_diff</function></member>
    <member><function>array_udiff</function></member>
    <member><function>array_diff_assoc</function></member>
    <member><function>array_diff_uassoc</function></member>
    <member><function>array_udiff_assoc</function></member>
    <member><function>array_udiff_uassoc</function></member>
    <member><function>array_diff_key</function></member>
    <member><function>array_diff_ukey</function></member>
    <member><function>array_intersect</function></member>
    <member><function>array_intersect_assoc</function></member>
    <member><function>array_intersect_uassoc</function></member>
    <member><function>array_intersect_key</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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