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185 lines
8.7 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>strstr 函数的忽略大小写版本</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.stristr" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">stristr</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">stristr</span> — <span class="dc-title"><span class="function"><a href="strstr.html" class="function">strstr()</a></span> 函数的忽略大小写版本</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.stristr-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>stristr</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$needle</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$before_needle</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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返回 <code class="parameter">haystack</code> 字符串从 <code class="parameter">needle</code> 第一次出现的位置开始到结尾的字符串。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.stristr-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">haystack</code></dt>
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<dd>
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<p class="para">
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在该字符串中查找。
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</p>
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</dd>
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<dt>
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<code class="parameter">needle</code></dt>
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<dd>
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<p class="para">
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如果 <code class="parameter">needle</code> 不是一个字符串，那么它将被转换为整型并被视为字符顺序值。
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</p>
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</dd>
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<dt>
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<code class="parameter">before_needle</code></dt>
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<dd>
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<p class="para">
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若为 <strong><code>TRUE</code></strong>，<span class="function"><a href="strstr.html" class="function">strstr()</a></span> 将返回 <code class="parameter">needle</code> 在 <code class="parameter">haystack</code> 中的位置之前的部分(不包括 needle)。
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</p>
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</dd>
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</dl>
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</p>
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<p class="para">
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参数 <code class="parameter">needle</code> 和 <code class="parameter">haystack</code> 将以不区分大小写的方式对待。
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.stristr-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回匹配的子字符串。如果 <code class="parameter">needle</code> 未找到，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.stristr-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>5.3.0</td>
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<td>
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新增可选的 <code class="parameter">before_needle</code> 参数。
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</td>
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</tr>
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<tr>
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<td>4.3.0</td>
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<td>
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<span class="function"><strong>stristr()</strong></span> 变为二进制安全的。
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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.stristr-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-5969">
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<p><strong>Example #1 <span class="function"><strong>stristr()</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 /> $email </span><span style="color: #007700">= </span><span style="color: #DD0000">'USER@EXAMPLE.com'</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'e'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 输出 ER@EXAMPLE.com<br /> </span><span style="color: #007700">echo </span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'e'</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">); </span><span style="color: #FF8000">// 自 PHP 5.3.0 起，输出 US<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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<p class="para">
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<div class="example" id="example-5970">
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<p><strong>Example #2 测试字符串的存在与否</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 /> $string </span><span style="color: #007700">= </span><span style="color: #DD0000">'Hello World!'</span><span style="color: #007700">;<br /> if(</span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">, </span><span style="color: #DD0000">'earth'</span><span style="color: #007700">) === </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'"earth" not found in string'</span><span style="color: #007700">;<br /> }<br /></span><span style="color: #FF8000">// 输出: "earth" not found in string<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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<p class="para">
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<div class="example" id="example-5971">
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<p><strong>Example #3 使用非字符串 needle</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 /> $string </span><span style="color: #007700">= </span><span style="color: #DD0000">'APPLE'</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">, </span><span style="color: #0000BB">97</span><span style="color: #007700">); </span><span style="color: #FF8000">// 97 = 小写字母 a<br />// 输出: APPLE<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 notes" id="refsect1-function.stristr-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数可安全用于二进制对象。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.stristr-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="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="strrchr.html" class="function" rel="rdfs-seeAlso">strrchr()</a> - 查找指定字符在字符串中的最后一次出现</span></li>
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<li class="member"><span class="function"><a href="stripos.html" class="function" rel="rdfs-seeAlso">stripos()</a> - 查找字符串首次出现的位置（不区分大小写）</span></li>
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<li class="member"><span class="function"><a href="strpbrk.html" class="function" rel="rdfs-seeAlso">strpbrk()</a> - 在字符串中查找一组字符的任何一个字符</span></li>
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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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</ul>
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</p>
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</div>
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</div></div></div></body></html> |