function.mb-convert-case.html
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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>Perform case folding on a string</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-check-encoding.html">mb_check_encoding</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mb-convert-encoding.html">mb_convert_encoding</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-convert-case" class="refentry"> <div class="refnamediv"> <h1 class="refname">mb_convert_case</h1> <p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">mb_convert_case</span> — <span class="dc-title">Perform case folding on a string</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_convert_case</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$mode</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$encoding</tt></span> ] )</div> <p class="para rdfs-comment"> Performs case folding on a <a href="language.types.string.html" class="type string">string</a>, converted in the way specified by <i><tt class="parameter">mode</tt></i>. </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 converted. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">mode</tt></i></span> <dd> <p class="para"> The mode of the conversion. It can be one of <b><tt>MB_CASE_UPPER</tt></b>, <b><tt>MB_CASE_LOWER</tt></b>, or <b><tt>MB_CASE_TITLE</tt></b>. </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"> A case folded version of <i><tt class="parameter">string</tt></i> converted in the way specified by <i><tt class="parameter">mode</tt></i>. </p> </div> <div class="refsect1 unicode"> <h3 class="title">Unicode</h3> <p class="para"> By contrast to the standard case folding functions such as <a href="function.strtolower.html" class="function">strtolower()</a> and <a href="function.strtoupper.html" class="function">strtoupper()</a>, case folding is performed on the basis of 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> <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> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>mb_convert_case()</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">$str </span><span style="color: #007700">= </span><span style="color: #0000BB">mb_convert_case</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">MB_CASE_UPPER</span><span style="color: #007700">, </span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$str</span><span style="color: #007700">; </span><span style="color: #FF8000">// Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO<br /></span><span style="color: #0000BB">$str </span><span style="color: #007700">= </span><span style="color: #0000BB">mb_convert_case</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">MB_CASE_TITLE</span><span style="color: #007700">, </span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$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-strtolower.html" class="function" rel="rdfs-seeAlso">mb_strtolower()</a></li> <li class="member"><a href="function.mb-strtoupper.html" class="function" rel="rdfs-seeAlso">mb_strtoupper()</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.ucfirst.html" class="function" rel="rdfs-seeAlso">ucfirst()</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.mb-check-encoding.html">mb_check_encoding</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mb-convert-encoding.html">mb_convert_encoding</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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