doc-zh/reference/array/functions/array-diff-ukey.xml at master · php/doc-zh · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 2226ad08fd93e3979efbba47c5ae3545eec97d25 Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.array-diff-ukey" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_diff_ukey</refname>
  <refpurpose>用回调函数对键名比较计算数组的差集</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_diff_ukey</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
   <methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
   <methodparam><type>callable</type><parameter>key_compare_func</parameter></methodparam>
  </methodsynopsis>
  <para>
   将 <parameter>array</parameter> 的键与 <parameter>arrays</parameter>
   的键进行比较并返回不存在于其它数组的键值。本函数和
   <function>array_diff</function> 很像，区别只是用键名来比较而不是值。
  </para>
  <para>
   此比较是通过用户提供的回调函数来进行的。如果认为第一个参数小于，等于，或大于第二个参数时必须分别返回一个小于零，等于零，或大于零的整数。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>

    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       要比较的数组
      </para>
     </listitem>
    </varlistentry>

    <varlistentry>
     <term><parameter>arrays</parameter></term>
     <listitem>
      <para>
       要比较的数组
      </para>
     </listitem>
    </varlistentry>

    <varlistentry>
     <term><parameter>key_compare_func</parameter></term>
     <listitem>
      &sort.callback.description;
     </listitem>
    </varlistentry>

   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回一个 <type>array</type>，该数组包含了 <parameter>array</parameter> 中存在但其它数组不存在的键值。
  </para>
 </refsect1>

<!--
 <refsect1 role="errors">
  &reftitle.errors;
  &errors.no.unusual.errors;
 </refsect1>
-->

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_diff_ukey</function> 例子</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_diff_ukey($array1, $array2, 'key_compare_func'));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
array(2) {
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    注意本函数只检查了多维数组中的一维。当然，可以用
    <literal>array_diff_ukey($array1[0], $array2[0], 'callback_func');</literal>
    来检查更深的维度。
   </para>
  </note>
 </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_intersect</function></member>
    <member><function>array_intersect_assoc</function></member>
    <member><function>array_intersect_uassoc</function></member>
    <member><function>array_intersect_key</function></member>
    <member><function>array_intersect_ukey</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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