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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Make a string's first character lowercase</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.join.html">join</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.levenshtein.html">levenshtein</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.lcfirst" class="refentry"> <div class="refnamediv"> <h1 class="refname">lcfirst</h1> <p class="verinfo">(No version information available, might be only in CVS)</p><p class="refpurpose"><span class="refname">lcfirst</span> — <span class="dc-title">Make a string's first character lowercase</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>lcfirst</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> )</div> <p class="para rdfs-comment"> Returns a string with the first character of <i><tt class="parameter">str</tt></i> , lowercased if that character is alphabetic. </p> <p class="para"> Note that 'alphabetic' is determined by the current locale. For instance, in the default "C" locale characters such as umlaut-a (盲) will not be converted. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">str</tt></i></span> <dd> <p class="para"> The input string. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the resulting string. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>lcfirst()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">'HelloWorld'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #0000BB">lcfirst</span><span style="color: #007700">(</span><span style="color: #0000BB">$foo</span><span style="color: #007700">); </span><span style="color: #FF8000">// helloWorld<br /><br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= </span><span style="color: #DD0000">'HELLO WORLD!'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= </span><span style="color: #0000BB">lcfirst</span><span style="color: #007700">(</span><span style="color: #0000BB">$bar</span><span style="color: #007700">); </span><span style="color: #FF8000">// hELLO WORLD!<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= </span><span style="color: #0000BB">lcfirst</span><span style="color: #007700">(</span><span style="color: #0000BB">strtoupper</span><span style="color: #007700">(</span><span style="color: #0000BB">$bar</span><span style="color: #007700">)); </span><span style="color: #FF8000">// hELLO WORLD!<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.ucfirst.html" class="function" rel="rdfs-seeAlso">ucfirst()</a></li> <li class="member"><a href="function.strtolower.html" class="function" rel="rdfs-seeAlso">strtolower()</a></li> <li class="member"><a href="function.strtoupper.html" class="function" rel="rdfs-seeAlso">strtoupper()</a></li> <li class="member"><a href="function.ucwords.html" class="function" rel="rdfs-seeAlso">ucwords()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.join.html">join</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.levenshtein.html">levenshtein</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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