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174 lines
9.1 KiB
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<!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>二进制安全比较字符串（从偏移位置比较指定长度）</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.substr-compare" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">substr_compare</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">substr_compare</span> — <span class="dc-title">二进制安全比较字符串（从偏移位置比较指定长度）</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.substr-compare-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>substr_compare</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$main_str</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$case_insensitivity</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
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]] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>substr_compare()</strong></span> 从偏移位置 <code class="parameter">offset</code> 开始比较 <code class="parameter">main_str</code> 与 <code class="parameter">str</code>，比较长度为 <code class="parameter">length</code> 个字符。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.substr-compare-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">main_str</code></dt>
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<dd>
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<p class="para">
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待比较的第一个字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">str</code></dt>
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<dd>
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<p class="para">
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待比较的第二个字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">offset</code></dt>
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<dd>
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<p class="para">
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比较开始的位置。如果为负数，则从字符串结尾处开始算起。
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</p>
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</dd>
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<dt>
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<code class="parameter">length</code></dt>
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<dd>
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<p class="para">
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比较的长度。默认值为 <code class="parameter">str</code> 的长度与 <code class="parameter">main_str</code> 的长度减去位置偏移量 <code class="parameter">offset</code> 后二者中的较大者。
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</p>
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</dd>
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<dt>
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<code class="parameter">case_insensitivity</code></dt>
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<dd>
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<p class="para">
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如果 <code class="parameter">case_insensitivity</code> 为 <strong><code>TRUE</code></strong>，比较将不区分大小写。
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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.substr-compare-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果 <code class="parameter">main_str</code> 从偏移位置 <code class="parameter">offset</code> 起的子字符串小于 <code class="parameter">str</code>，则返回小于 0 的数；如果大于 <code class="parameter">str</code>，则返回大于 0 的数；如果二者相等，则返回 0。如果 <code class="parameter">offset</code> 大于等于 <code class="parameter">main_str</code> 的长度或 <code class="parameter">length</code> 被设置为小于 1 的值（ PHP 5.5.11 之前的版本），<span class="function"><strong>substr_compare()</strong></span> 将打印出一条警告信息并且返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.substr-compare-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.5.11</td>
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<td>
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<code class="parameter">length</code> 可以是 <em>0</em>。
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</td>
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</tr>
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<tr>
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<td>5.1.0</td>
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<td>
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允许使用负数的 <code class="parameter">offset</code> 参数。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.substr-compare-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-5991">
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<p><strong>Example #1 <span class="function"><strong>substr_compare()</strong></span> 范例</strong></p>
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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 /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"bc"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"de"</span><span style="color: #007700">, -</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"bcg"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"BC"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">); </span><span style="color: #FF8000">// 0<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"bc"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">); </span><span style="color: #FF8000">// 1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"cd"</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">); </span><span style="color: #FF8000">// -1<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_compare</span><span style="color: #007700">(</span><span style="color: #DD0000">"abcde"</span><span style="color: #007700">, </span><span style="color: #DD0000">"abc"</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">); </span><span style="color: #FF8000">// warning<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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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.substr-compare-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="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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</ul>
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</p>
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</div>
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</div></div></div></body></html> |