mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 05:26:57 +08:00
162 lines
6.9 KiB
HTML
162 lines
6.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
<html>
|
||
<head>
|
||
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
||
<title>查找字符串的首次出现</title>
|
||
</head>
|
||
<body class="docs"><div id="layout">
|
||
<div id="layout-content"><div id="function.strstr" class="refentry">
|
||
<div class="refnamediv">
|
||
<h1 class="refname">strstr</h1>
|
||
<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>
|
||
|
||
</div>
|
||
|
||
<div class="refsect1 description" id="refsect1-function.strstr-description">
|
||
<h3 class="title">说明</h3>
|
||
<div class="methodsynopsis dc-description">
|
||
<span class="methodname"><strong>strstr</strong></span>
|
||
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span>
|
||
, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$needle</code></span>
|
||
[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$before_needle</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
|
||
] ) : <span class="type">string</span></div>
|
||
|
||
<p class="para rdfs-comment">
|
||
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。
|
||
</p>
|
||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||
<p class="para">
|
||
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>。
|
||
</p>
|
||
</p></blockquote>
|
||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||
<p class="para">
|
||
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。
|
||
</p>
|
||
</p></blockquote>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 parameters" id="refsect1-function.strstr-parameters">
|
||
<h3 class="title">参数</h3>
|
||
<p class="para">
|
||
<dl>
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">haystack</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
输入字符串。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">needle</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
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。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
|
||
<dt>
|
||
<code class="parameter">before_needle</code></dt>
|
||
|
||
<dd>
|
||
|
||
<p class="para">
|
||
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。
|
||
</p>
|
||
</dd>
|
||
|
||
|
||
</dl>
|
||
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 returnvalues" id="refsect1-function.strstr-returnvalues">
|
||
<h3 class="title">返回值</h3>
|
||
<p class="para">
|
||
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>）。
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 changelog" id="refsect1-function.strstr-changelog">
|
||
<h3 class="title">更新日志</h3>
|
||
<p class="para">
|
||
<table class="doctable informaltable">
|
||
|
||
<thead>
|
||
<tr>
|
||
<th>版本</th>
|
||
<th>说明</th>
|
||
</tr>
|
||
|
||
</thead>
|
||
|
||
<tbody class="tbody">
|
||
<tr>
|
||
<td>5.3.0</td>
|
||
<td>
|
||
新增可选的 <code class="parameter">before_needle</code> 参数。
|
||
</td>
|
||
</tr>
|
||
|
||
<tr>
|
||
<td>4.3.0</td>
|
||
<td>
|
||
<span class="function"><strong>strstr()</strong></span> 成为二进制安全的。
|
||
</td>
|
||
</tr>
|
||
|
||
</tbody>
|
||
|
||
</table>
|
||
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 examples" id="refsect1-function.strstr-examples">
|
||
<h3 class="title">范例</h3>
|
||
<p class="para">
|
||
<div class="example" id="example-5983">
|
||
<p><strong>Example #1 <span class="function"><strong>strstr()</strong></span> 范例</strong></p>
|
||
<div class="example-contents">
|
||
<div class="phpcode"><pre><span style="color: #000000">
|
||
<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>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
</div>
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 seealso" id="refsect1-function.strstr-seealso">
|
||
<h3 class="title">参见</h3>
|
||
<p class="para">
|
||
<ul class="simplelist">
|
||
<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>
|
||
<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>
|
||
<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>
|
||
<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>
|
||
<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>
|
||
</ul>
|
||
</p>
|
||
</div>
|
||
|
||
|
||
</div></div></div></body></html> |