uksort.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="arrayobject.uksort" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>ArrayObject::uksort</refname>
  <refpurpose>Sort the entries by keys using a user-defined comparison function</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="ArrayObject">
   <modifier>public</modifier> <type>true</type><methodname>ArrayObject::uksort</methodname>
   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function sorts the keys of the entries using a user-supplied
   comparison function. The key to entry correlations will be maintained.
  </para>
  &note.sort-unstable;
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>callback</parameter></term>
     <listitem>
      &sort.callback.description;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.true.always;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      &return.type.true;
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>ArrayObject::uksort</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
function cmp($a, $b) {
    $a = preg_replace('@^(a|an|the) @', '', $a);
    $b = preg_replace('@^(a|an|the) @', '', $b);
    return strcasecmp($a, $b);
}

$array = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);
$arrayObject = new ArrayObject($array);
$arrayObject->uksort('cmp');

foreach ($arrayObject as $key => $value) {
    echo "$key: $value\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
an apple: 3
a banana: 4
the Earth: 2
John: 1
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>ArrayObject::asort</methodname></member>
    <member><methodname>ArrayObject::ksort</methodname></member>
    <member><methodname>ArrayObject::natsort</methodname></member>
    <member><methodname>ArrayObject::natcasesort</methodname></member>
    <member><methodname>ArrayObject::uasort</methodname></member>
    <member><function>uksort</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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