php-doc-en/reference/array/functions/array-udiff-uassoc.xml

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<refentry xml:id="function.array-udiff-uassoc" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_udiff_uassoc</refname>
  <refpurpose>Computes the difference of arrays with additional index check, compares data and indexes by a callback function</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_udiff_uassoc</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>data_compare_func</parameter></methodparam>
   <methodparam><type>callback</type><parameter>key_compare_func</parameter></methodparam>
  </methodsynopsis>
  <para>
   Computes the difference of arrays with additional index check, compares
   data and indexes by a callback function.
  </para>
  <para>
   Note that the keys are used in the comparison unlike
   <function>array_diff</function> and <function>array_udiff</function>.
  </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>
       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.
      </para>
      <para>
       The comparison of arrays' data is performed by using an user-supplied
       callback : <parameter>data_compare_func</parameter>. In this aspect
       the behaviour is opposite to the behaviour of
       <function>array_diff_assoc</function> which uses internal function for
       comparison.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>key_compare_func</parameter></term>
     <listitem>
      <para>
       The comparison of keys (indices) is done also by the callback function
       <parameter>key_compare_func</parameter>. This behaviour is unlike what
       <function>array_udiff_assoc</function> does, since the latter compares
       the indices by using an internal function.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an <type>array</type> containing all the values from
   <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_uassoc</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;
    }

    static function comp_func_key($a, $b)
    {
        if ($a === $b) return 0;
        return ($a > $b)? 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),);

$result = array_udiff_uassoc($a, $b, array("cr", "comp_func_cr"), array("cr", "comp_func_key"));
print_r($result);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0.1] => cr Object
        (
            [priv_member:private] => 9
        )

    [0.5] => cr Object
        (
            [priv_member:private] => 12
        )

    [0] => cr Object
        (
            [priv_member:private] => 23
        )
)
]]>
    </screen>
   </example>
  </para>
  <simpara>
   In our example above you see the <literal>"1" =&gt; new cr(4)</literal>
   pair is present in both arrays and thus it is not in the output from the
   function. Keep in mind that you have to supply 2 callback functions.
  </simpara>
 </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, for example,
    <literal>array_udiff_uassoc($array1[0], $array2[0], "data_compare_func",
    "key_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_udiff</function></member>
    <member><function>array_udiff_assoc</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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