array-intersect-ukey.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.array-intersect-ukey" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_intersect_ukey</refname>
  <refpurpose>在键名上使用回调函数来比较计算数组的交集</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_intersect_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>
   <function>array_intersect_ukey</function> 返回一个数组，该数组包含了所有在
   <parameter>array</parameter> 和其它参数数组中同时存在的键名的值。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       用于数组比较的初始数组。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>arrays</parameter></term>
     <listitem>
      <para>
       用于比较键的数组。
      </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 <parameter>array</parameter> 的值，其键名同时存在于所有参数数组中。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_intersect_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_intersect_ukey($array1, $array2, 'key_compare_func'));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}
]]>
    </screen>
   </example>
  </para>
  <para>
   上例中可以看到，只有 <literal>'blue'</literal>
   和 <literal>'green'</literal> 两个键名出现在两个数组中，因此被返回。另外注意
   <literal>'blue'</literal> 和 <literal>'green'</literal>
   的值在两个数组中是不同的。但因为只检查键名，因此还是匹配。返回的是
   <parameter>array</parameter> 中的值。
  </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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