archived-doc-zh/reference/array/functions/array-udiff-assoc.xml

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<refentry xml:id="function.array-udiff-assoc" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_udiff_assoc</refname>
  <refpurpose>带索引检查计算数组的差集，用回调函数比较数据</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_udiff_assoc</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
   <methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
   <methodparam><type>callable</type><parameter>value_compare_func</parameter></methodparam>
  </methodsynopsis>
  <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>
  <note>
   <simpara>
    注意本函数只检查了多维数组中的一维。当然，可以用
    <literal>array_udiff_assoc($array1[0], $array2[0], "some_comparison_func");</literal>
    来检查更深的维度。
   </simpara>
  </note>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       第一个数组。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>arrays</parameter></term>
     <listitem>
      <para>
       要比较的数组。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value_compare_func</parameter></term>
     <listitem>
      &sort.callback.description;
      &sort.callback.description.presort;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
 <function>array_udiff_assoc</function> 返回一个数组，该数组包括了所有在
   <parameter>array</parameter> 中但是不在任何其它参数数组中的值。注意和
   <function>array_diff</function> 与 <function>array_udiff</function>
   不同的是键名也用于比较。数组数据的比较是用用户提供的回调函数进行的。在此方面和
   <function>array_diff_assoc</function> 的行为正好相反，后者是用内部函数进行比较的。
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_udiff_assoc</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
class cr {
    private $priv_member;
    function __construct($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),);

$result = array_udiff_assoc($a, $b, array("cr", "comp_func_cr"));
print_r($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>
   上例中可以看到键值对 <literal>"1" =&gt; new cr(4)</literal>
   同时出现在两个数组中因此不在本函数的输出中。
  </simpara>
 </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</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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