natsort.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- CREDITS: shimooka,mumumu -->
<refentry xml:id="function.natsort" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>natsort</refname>
  <refpurpose>"自然順"アルゴリズムで配列をソートする</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>true</type><methodname>natsort</methodname>
   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
  </methodsynopsis>
  <para>
   この関数は、人間が行うような手法でアルファベットまたは数字の文字列の順番を
   キー/値の関係を保持したままソートします。
   これは、"自然順(natural ordering)"と呼ばれているものです。
   このアルゴリズムと (<function>sort</function> を用いた)
   通常のコンピュータ文字列ソートアルゴリズムの違いを示す例を以下に示します。
  </para>
  &note.sort-unstable;
  &note.reset-index;
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       入力の配列。
      </para>
     </listitem>
    </varlistentry>
   </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>natsort</function> の基本的な使用例</title>
    <programlisting role="php">
<![CDATA[
<?php
$array1 = $array2 = array("img12.png", "img10.png", "img2.png", "img1.png");

asort($array1);
echo "Standard sorting\n";
print_r($array1);

natsort($array2);
echo "\nNatural order sorting\n";
print_r($array2);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Standard sorting
Array
(
    [3] => img1.png
    [1] => img10.png
    [0] => img12.png
    [2] => img2.png
)

Natural order sorting
Array
(
    [3] => img1.png
    [2] => img2.png
    [1] => img10.png
    [0] => img12.png
)
]]>
    </screen>
    <para>
     より詳細な情報については、Martin Poolの <link xlink:href="&url.strnatcmp;">Natural Order String Comparison</link> ページを参照ください。
    </para>
   </example>
   <example>
    <title><function>natsort</function> をより知るための例</title>
    <programlisting role="php">
<![CDATA[
<?php
echo "負の数\n";
$negative = array('-5','3','-2','0','-1000','9','1');
print_r($negative);
natsort($negative);
print_r($negative);

echo "ゼロ埋め\n";
$zeros = array('09', '8', '10', '009', '011', '0'); 
print_r($zeros);
natsort($zeros);
print_r($zeros);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
負の数
Array
(
    [0] => -5
    [1] => 3
    [2] => -2
    [3] => 0
    [4] => -1000
    [5] => 9
    [6] => 1
)
Array
(
    [2] => -2
    [0] => -5
    [4] => -1000
    [3] => 0
    [6] => 1
    [1] => 3
    [5] => 9
)

ゼロ埋め
Array
(
    [0] => 09
    [1] => 8
    [2] => 10
    [3] => 009
    [4] => 011
    [5] => 0
)
Array
(
    [5] => 0
    [1] => 8
    [3] => 009
    [0] => 09
    [2] => 10
    [4] => 011
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>natcasesort</function></member>
    <member>&seealso.array.sorting;</member>
    <member><function>strnatcmp</function></member>
    <member><function>strnatcasecmp</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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