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<refentry xml:id="function.array-udiff" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_udiff</refname>
  <refpurpose>Computes the difference of arrays by using a callback function for data comparison</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_udiff</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>callable</type><parameter>data_compare_func</parameter></methodparam>
  </methodsynopsis>
  <para>
   Computes the difference of arrays by using a callback function for data
   comparison. This is unlike <function>array_diff</function> which uses an
   internal function for comparing the data.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array1</parameter></term>
     <listitem>
      <para>
       The first array.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>array2</parameter></term>
     <listitem>
      <para>
       The second array.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>data_compare_func</parameter></term>
     <listitem>
      <para>
       The callback comparison function.
      </para>
      <para>
       &return.callbacksort;
      </para>
      &callback.cmp;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array containing all the values of <parameter>array1</parameter>
   that are not present in any of the other arguments.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_udiff</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
class cr {
    private $priv_member;
    function cr($val)
    {
        $this->priv_member = $val;
    }

    static function comp_func_cr($a, $b)
    {
        if ($a->priv_member === $b->priv_member) return 0;
        return ($a->priv_member > $b->priv_member)? 1:-1;
    }
}
$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);

$result = array_udiff($a, $b, array("cr", "comp_func_cr"));
print_r($result);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0.5] => cr Object
        (
            [priv_member:private] => 12
        )

    [0] => cr Object
        (
            [priv_member:private] => 23
        )

)
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <simpara>
    Please note that this function only checks one dimension of a n-dimensional
    array. Of course you can check deeper dimensions by using
    <literal>array_udiff($array1[0], $array2[0], "data_compare_func");</literal>.
   </simpara>
  </note>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_diff</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_intersect</function></member>
    <member><function>array_intersect_assoc</function></member>
    <member><function>array_uintersect</function></member>
    <member><function>array_uintersect_assoc</function></member>
    <member><function>array_uintersect_uassoc</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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