archived-doc-zh/reference/array/functions/sort.xml

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<refentry xml:id="function.sort" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>sort</refname>
  <refpurpose>对数组升序排序</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>true</type><methodname>sort</methodname>
   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>SORT_REGULAR</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   对 <parameter>array</parameter> 本身按照值（value）升序排序。
  </para>
  &note.sort-unstable;
  &note.no-key-association;
  &note.reset-index;
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       输入的数组。
      </para>
     </listitem>
    </varlistentry>
    &sort.flags.parameter;
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.true.always;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      &return.type.true;
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>sort</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

$fruits = array("lemon", "orange", "banana", "apple");
sort($fruits);
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
fruits[0] = apple
fruits[1] = banana
fruits[2] = lemon
fruits[3] = orange
]]>
    </screen>
   </example>
  </para>
  <para>
   fruits 被按照字母顺序排序。
  </para>
  <para>
   <example>
    <title>使用 <function>sort</function> 不区分大小写自然排序的示例</title>
    <programlisting role="php">
<![CDATA[
<?php

$fruits = array(
    "Orange1", "orange2", "Orange3", "orange20"
);
sort($fruits, SORT_NATURAL | SORT_FLAG_CASE);
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
fruits[0] = Orange1
fruits[1] = orange2
fruits[2] = Orange3
fruits[3] = orange20
]]>
    </screen>
   </example>
  </para>
  <para>
   fruits 排序得像 <function>natcasesort</function> 的结果。
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <simpara>
    和大多数 PHP 排序函数一样，<function>sort</function> 使用了 <link
    xlink:href="&url.wiki.quicksort;">快速排序</link> 实现的。
    在已排序的数组分片的中间，选择基准值，具有最优时间。但不应该依赖它实现的细节。
   </simpara>
  </note>
  <warning>
   <simpara>
    在对含有混合类型值的数组以 <parameter>flags</parameter> 为 <constant>SORT_REGULAR</constant>
    排序时要小心，因为 <function>sort</function> 可能会产生不可预知的结果。
   </simpara>
  </warning>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>rsort</function></member>
   <member>&seealso.array.sorting;</member>
  </simplelist>
 </refsect1>

</refentry>
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