array-count-values.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.array-count-values" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_count_values</refname>
  <refpurpose>统计数组中每个不同值的出现次数</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_count_values</methodname>
   <methodparam><type>array</type><parameter>array</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>array_count_values</function> 返回一个数组：
     数组的键（必须是 &integer; 或 &string;）是 <parameter>array</parameter> 里单元的值；
     数组的值是 <parameter>array</parameter> 单元的值出现的次数。
  </para>
 </refsect1>

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

    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       统计这个数组的值
      </para>
     </listitem>
    </varlistentry>

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

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
    返回一个关联数组，用 <parameter>array</parameter>
    数组中的值作为键名，该值在数组中出现的次数作为值。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   对数组里面的每个不是 <type>string</type> 或 <type>int</type> 类型的元素抛出一个警告错误（<constant>E_WARNING</constant>）。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_count_values</function> 例子</title>
    <programlisting role="php">
<![CDATA[
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [1] => 2
    [hello] => 2
    [world] => 1
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>count</function></member>
    <member><function>array_unique</function></member>
    <member><function>array_values</function></member>
    <member><function>count_chars</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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