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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 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.mb-strstr.html">mb_strstr</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mb-strtoupper.html">mb_strtoupper</a></div> <div class="up"><a href="ref.mbstring.html">Multibyte String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mb-strtolower" class="refentry"> <div class="refnamediv"> <h1 class="refname">mb_strtolower</h1> <p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">mb_strtolower</span> — <span class="dc-title">Make a string 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>mb_strtolower</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$encoding</tt></span> ] )</div> <p class="para rdfs-comment"> Returns <i><tt class="parameter">str</tt></i> with all alphabetic characters converted to lowercase. </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 <a href="language.types.string.html" class="type string">string</a> being lowercased. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">encoding</tt></i></span> <dd> <p class="para">The <i><tt class="parameter">encoding</tt></i> parameter is the character encoding. If it is omitted, the internal character encoding value will be used.</p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <i><tt class="parameter">str</tt></i> with all alphabetic characters converted to lowercase. </p> </div> <div class="refsect1 unicode"> <h3 class="title">Unicode</h3> <p class="para"> For more information about the Unicode properties, please see <a href="http://www.unicode.org/unicode/reports/tr21/" class="link external">» http://www.unicode.org/unicode/reports/tr21/</a>. </p> <p class="para"> By contrast to <a href="function.strtolower.html" class="function">strtolower()</a>, 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as A-umlaut (脛). </p></div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>mb_strtolower()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">"Mary Had A Little Lamb and She LOVED It So"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$str </span><span style="color: #007700">= </span><span style="color: #0000BB">mb_strtolower</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$str</span><span style="color: #007700">; </span><span style="color: #FF8000">// Prints mary had a little lamb and she loved it so<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.mb-strtoupper.html" class="function" rel="rdfs-seeAlso">mb_strtoupper()</a></li> <li class="member"><a href="function.mb-convert-case.html" class="function" rel="rdfs-seeAlso">mb_convert_case()</a></li> <li class="member"><a href="function.strtolower.html" class="function" rel="rdfs-seeAlso">strtolower()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mb-strstr.html">mb_strstr</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mb-strtoupper.html">mb_strtoupper</a></div> <div class="up"><a href="ref.mbstring.html">Multibyte 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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