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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>Encodes an ISO-8859-1 string to UTF-8</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.utf8-decode.html">utf8_decode</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.xml-error-string.html">xml_error_string</a></div> <div class="up"><a href="ref.xml.html">XML Parser Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.utf8-encode" class="refentry"> <div class="refnamediv"> <h1 class="refname">utf8_encode</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">utf8_encode</span> — <span class="dc-title">Encodes an ISO-8859-1 string to UTF-8</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>utf8_encode</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$data</tt></span> )</div> <p class="para rdfs-comment"> This function encodes the string <i><tt class="parameter">data</tt></i> to <i>UTF-8</i>, and returns the encoded version. <i>UTF-8</i> is a standard mechanism used by <acronym title="Unique, Universal, and Uniform character enCoding">Unicode</acronym> for encoding <span class="glossterm">wide character</span> values into a byte stream. <i>UTF-8</i> is transparent to plain <abbr class="abbrev">ASCII</abbr> characters, is self-synchronized (meaning it is possible for a program to figure out where in the bytestream characters start) and can be used with normal string comparison functions for sorting and such. PHP encodes <i>UTF-8</i> characters in up to four bytes, like this: <table border="5"> <caption><b>UTF-8 encoding</b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">bytes</th> <th colspan="1">bits</th> <th colspan="1">representation</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">1</td> <td colspan="1" rowspan="1" align="left">7</td> <td colspan="1" rowspan="1" align="left">0bbbbbbb</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">2</td> <td colspan="1" rowspan="1" align="left">11</td> <td colspan="1" rowspan="1" align="left">110bbbbb 10bbbbbb</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3</td> <td colspan="1" rowspan="1" align="left">16</td> <td colspan="1" rowspan="1" align="left">1110bbbb 10bbbbbb 10bbbbbb</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4</td> <td colspan="1" rowspan="1" align="left">21</td> <td colspan="1" rowspan="1" align="left">11110bbb 10bbbbbb 10bbbbbb 10bbbbbb</td> </tr> </tbody> </colgroup> </table> Each <span class="replaceable">b</span> represents a bit that can be used to store character data. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">data</tt></i></span> <dd> <p class="para"> An ISO-8859-1 string. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the UTF-8 translation of <i><tt class="parameter">data</tt></i>. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.utf8-decode.html">utf8_decode</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.xml-error-string.html">xml_error_string</a></div> <div class="up"><a href="ref.xml.html">XML Parser 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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