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<!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>二进制安全比较字符串（不区分大小写）</title>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.strcasecmp" class="refentry">
<div class="refnamediv">
<h1 class="refname">strcasecmp</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">strcasecmp</span> &mdash; <span class="dc-title">二进制安全比较字符串（不区分大小写）</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.strcasecmp-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>strcasecmp</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str1</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$str2</code></span>
) : <span class="type">int</span></div>
<p class="para rdfs-comment">
二进制安全比较字符串（不区分大小写）。
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.strcasecmp-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">str1</code></dt>
<dd>
<p class="para">
第一个字符串。
</p>
</dd>
<dt>
<code class="parameter">str2</code></dt>
<dd>
<p class="para">
第二个字符串。
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.strcasecmp-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
如果 <code class="parameter">str1</code> 小于
<code class="parameter">str2</code> 返回 &lt; 0；
如果 <code class="parameter">str1</code>
大于 <code class="parameter">str2</code>
返回 &gt; 0；如果两者相等，返回 0。
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.strcasecmp-examples">
<h3 class="title">范例</h3>
<p class="para">
<div class="example" id="example-5962">
<p><strong>Example #1 <span class="function"><strong>strcasecmp()</strong></span> 范例</strong></p>
<div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$var1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"Hello"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$var2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"hello"</span><span style="color: #007700">;<br />if&nbsp;(</span><span style="color: #0000BB">strcasecmp</span><span style="color: #007700">(</span><span style="color: #0000BB">$var1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$var2</span><span style="color: #007700">)&nbsp;==&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">'$var1&nbsp;is&nbsp;equal&nbsp;to&nbsp;$var2&nbsp;in&nbsp;a&nbsp;case-insensitive&nbsp;string&nbsp;comparison'</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.strcasecmp-seealso">
<h3 class="title">参见</h3>
<p class="para">
<ul class="simplelist">
<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>
<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="substr_compare.html" class="function" rel="rdfs-seeAlso">substr_compare()</a> - 二进制安全比较字符串（从偏移位置比较指定长度）</span></li>
<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>
<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="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>