count-chars.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.count-chars" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>count_chars</refname>
  <refpurpose>返回字符串所用字符的信息</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>string</type></type><methodname>count_chars</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   统计 <parameter>string</parameter>
   中每个字节值（0..255）出现的次数，使用多种模式返回结果。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       需要统计的字符串。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
       参见返回的值。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   根据不同的   <parameter>mode</parameter>，<function>count_chars</function>
   返回下列不同的结果：
   <itemizedlist>
    <listitem>
     <simpara>
      0 - 以所有的每个字节值作为键名，出现次数作为值的数组。
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      1 - 与 0 相同，但只列出出现次数大于零的字节值。
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      2 - 与 0 相同，但只列出出现次数等于零的字节值。
     </simpara>
    </listitem>
    <listitem>
     <simpara>
      3 - 返回由所有使用了的字节值组成的字符串。
     </simpara>
    </listitem>
    <listitem>
     <simpara>
     4 - 返回由所有未使用的字节值组成的字符串。
     </simpara>
    </listitem>
   </itemizedlist>
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       在此版本之前，函数在失败时返回 &false;。
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>count_chars</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$data = "Two Ts and one F.";

foreach (count_chars($data, 1) as $i => $val) {
   echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
There were 4 instance(s) of " " in the string.
There were 1 instance(s) of "." in the string.
There were 1 instance(s) of "F" in the string.
There were 2 instance(s) of "T" in the string.
There were 1 instance(s) of "a" in the string.
There were 1 instance(s) of "d" in the string.
There were 1 instance(s) of "e" in the string.
There were 2 instance(s) of "n" in the string.
There were 2 instance(s) of "o" in the string.
There were 1 instance(s) of "s" in the string.
There were 1 instance(s) of "w" in the string.
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>strpos</function></member>
    <member><function>substr_count</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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