mirror of
https://github.com/fofolee/uTools-Manuals.git
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v0.0.2
This commit is contained in:
fofolee
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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>查找字符串的首次出现</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.strstr" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">strstr</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">strstr</span> — <span class="dc-title">查找字符串的首次出现</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.strstr-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>strstr</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 <code class="parameter">haystack</code> 结尾的字符串。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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该函数区分大小写。如果想要不区分大小写，请使用 <span class="function"><a href="stristr.html" class="function">stristr()</a></span>。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果你仅仅想确定 <code class="parameter">needle</code> 是否存在于 <code class="parameter">haystack</code> 中，请使用速度更快、耗费内存更少的 <span class="function"><a href="strpos.html" class="function">strpos()</a></span> 函数。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.strstr-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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输入字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">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，那么它将被转化为整型并且作为字符的序号来使用。
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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"><strong>strstr()</strong></span> 将返回 <code class="parameter">needle</code> 在 <code class="parameter">haystack</code> 中的位置之前的部分。
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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.strstr-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回字符串的一部分或者 <strong><code>FALSE</code></strong>（如果未发现 <code class="parameter">needle</code>）。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.strstr-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>strstr()</strong></span> 成为二进制安全的。
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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.strstr-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-5983">
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<p><strong>Example #1 <span class="function"><strong>strstr()</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">'name@example.com'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$domain </span><span style="color: #007700">= </span><span style="color: #0000BB">strstr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'@'</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$domain</span><span style="color: #007700">; </span><span style="color: #FF8000">// 打印 @example.com<br /><br /></span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">strstr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'@'</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">); </span><span style="color: #FF8000">// 从 PHP 5.3.0 起<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$user</span><span style="color: #007700">; </span><span style="color: #FF8000">// 打印 name<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.strstr-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="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="strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a> - 查找字符串首次出现的位置</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="substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - 返回字符串的子串</span></li>
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</ul>
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</p>
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</div>
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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>查找字符串的首次出现</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.strstr" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">strstr</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">strstr</span> — <span class="dc-title">查找字符串的首次出现</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.strstr-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>strstr</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 <code class="parameter">haystack</code> 结尾的字符串。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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该函数区分大小写。如果想要不区分大小写，请使用 <span class="function"><a href="stristr.html" class="function">stristr()</a></span>。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果你仅仅想确定 <code class="parameter">needle</code> 是否存在于 <code class="parameter">haystack</code> 中，请使用速度更快、耗费内存更少的 <span class="function"><a href="strpos.html" class="function">strpos()</a></span> 函数。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.strstr-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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输入字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">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，那么它将被转化为整型并且作为字符的序号来使用。
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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"><strong>strstr()</strong></span> 将返回 <code class="parameter">needle</code> 在 <code class="parameter">haystack</code> 中的位置之前的部分。
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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.strstr-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回字符串的一部分或者 <strong><code>FALSE</code></strong>（如果未发现 <code class="parameter">needle</code>）。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.strstr-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>strstr()</strong></span> 成为二进制安全的。
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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.strstr-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-5983">
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<p><strong>Example #1 <span class="function"><strong>strstr()</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">'name@example.com'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$domain </span><span style="color: #007700">= </span><span style="color: #0000BB">strstr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'@'</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$domain</span><span style="color: #007700">; </span><span style="color: #FF8000">// 打印 @example.com<br /><br /></span><span style="color: #0000BB">$user </span><span style="color: #007700">= </span><span style="color: #0000BB">strstr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">, </span><span style="color: #DD0000">'@'</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">); </span><span style="color: #FF8000">// 从 PHP 5.3.0 起<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$user</span><span style="color: #007700">; </span><span style="color: #FF8000">// 打印 name<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.strstr-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="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="strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a> - 查找字符串首次出现的位置</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="substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - 返回字符串的子串</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>
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