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137 lines
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HTML
137 lines
7.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>使用自然排序算法比较字符串</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.strnatcmp" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">strnatcmp</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">strnatcmp</span> — <span class="dc-title">使用自然排序算法比较字符串</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.strnatcmp-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>strnatcmp</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str1</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$str2</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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该函数实现了以人类习惯对数字型字符串进行排序的比较算法，这就是“自然顺序”。注意该比较区分大小写。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.strnatcmp-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">str1</code></dt>
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<dd>
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<p class="para">
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第一个字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">str2</code></dt>
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<dd>
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<p class="para">
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第二个字符串。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.strnatcmp-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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与其他字符串比较函数类似，如果 <code class="parameter">str1</code> 小于
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<code class="parameter">str2</code> 返回 < 0；
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如果 <code class="parameter">str1</code>
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大于 <code class="parameter">str2</code>
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返回 > 0；如果两者相等，返回 0。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.strnatcmp-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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下面的例子展示了该算法与计算机常规字符串比较算法（ <span class="function"><a href="strcmp.html" class="function">strcmp()</a></span> 所使用的）的区别：
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<div class="informalexample">
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$arr1 </span><span style="color: #007700">= </span><span style="color: #0000BB">$arr2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"img12.png"</span><span style="color: #007700">, </span><span style="color: #DD0000">"img10.png"</span><span style="color: #007700">, </span><span style="color: #DD0000">"img2.png"</span><span style="color: #007700">, </span><span style="color: #DD0000">"img1.png"</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"Standard string comparison\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">usort</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr1</span><span style="color: #007700">, </span><span style="color: #DD0000">"strcmp"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr1</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"\nNatural order string comparison\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">usort</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr2</span><span style="color: #007700">, </span><span style="color: #DD0000">"strnatcmp"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$arr2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<p class="para">以上例程会输出：</p>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Standard string comparison
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Array
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(
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[0] => img1.png
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[1] => img10.png
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[2] => img12.png
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[3] => img2.png
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)
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Natural order string comparison
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Array
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(
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[0] => img1.png
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[1] => img2.png
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[2] => img10.png
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[3] => img12.png
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)
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</pre></div>
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</div>
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</div>
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更多信息，参见：Martin Pool 的<a href="http://sourcefrog.net/projects/natsort/" class="link external">» 自然顺序的字符串比较</a>
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page.
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.strnatcmp-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="preg_match.html" class="function" rel="rdfs-seeAlso">preg_match()</a> - 执行匹配正则表达式</span></li>
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<li class="member"><span class="function"><a href="strcasecmp.html" class="function" rel="rdfs-seeAlso">strcasecmp()</a> - 二进制安全比较字符串（不区分大小写）</span></li>
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<li class="member"><span class="function"><a href="substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - 返回字符串的子串</span></li>
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<li class="member"><span class="function"><a href="stristr.html" class="function" rel="rdfs-seeAlso">stristr()</a> - strstr 函数的忽略大小写版本</span></li>
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<li class="member"><span class="function"><a href="strcmp.html" class="function" rel="rdfs-seeAlso">strcmp()</a> - 二进制安全字符串比较</span></li>
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<li class="member"><span class="function"><a href="strncmp.html" class="function" rel="rdfs-seeAlso">strncmp()</a> - 二进制安全比较字符串开头的若干个字符</span></li>
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<li class="member"><span class="function"><a href="strncasecmp.html" class="function" rel="rdfs-seeAlso">strncasecmp()</a> - 二进制安全比较字符串开头的若干个字符（不区分大小写）</span></li>
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<li class="member"><span class="function"><a href="strnatcasecmp.html" class="function" rel="rdfs-seeAlso">strnatcasecmp()</a> - 使用“自然顺序”算法比较字符串（不区分大小写）</span></li>
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<li class="member"><span class="function"><a href="strstr.html" class="function" rel="rdfs-seeAlso">strstr()</a> - 查找字符串的首次出现</span></li>
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<li class="member"><span class="function"><a href="natsort.html" class="function" rel="rdfs-seeAlso">natsort()</a> - 用“自然排序”算法对数组排序</span></li>
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<li class="member"><span class="function"><a href="natcasesort.html" class="function" rel="rdfs-seeAlso">natcasesort()</a> - 用“自然排序”算法对数组进行不区分大小写字母的排序</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |