function.iconv-substr.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>Cut out part of 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.iconv-strrpos.html">iconv_strrpos</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.iconv.html">iconv</a></div> <div class="up"><a href="ref.iconv.html">iconv Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.iconv-substr" class="refentry"> <div class="refnamediv"> <h1 class="refname">iconv_substr</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">iconv_substr</span> — <span class="dc-title">Cut out part of 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>iconv_substr</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$offset</tt></span> )</div> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>iconv_substr</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$str</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$offset</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$length</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$charset</tt></span> )</div> <p class="para rdfs-comment"> Cuts a portion of <i><tt class="parameter">str</tt></i> specified by the <i><tt class="parameter">offset</tt></i> and <i><tt class="parameter">length</tt></i> parameters. </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 original string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">offset</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">offset</tt></i> is non-negative, <b>iconv_substr()</b> cuts the portion out of <i><tt class="parameter">str</tt></i> beginning at <i><tt class="parameter">offset</tt></i>'th character, counting from zero. </p> <p class="para"> If <i><tt class="parameter">offset</tt></i> is negative, <b>iconv_substr()</b> cuts out the portion beginning at the position, <i><tt class="parameter">offset</tt></i> characters away from the end of <i><tt class="parameter">str</tt></i>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">length</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">length</tt></i> is given and is positive, the return value will contain at most <i><tt class="parameter">length</tt></i> characters of the portion that begins at <i><tt class="parameter">offset</tt></i> (depending on the length of <i><tt class="parameter">string</tt></i>). </p> <p class="para"> If negative <i><tt class="parameter">length</tt></i> is passed, <b>iconv_substr()</b> cuts the portion out of <i><tt class="parameter">str</tt></i> from the <i><tt class="parameter">offset</tt></i>'th character up to the character that is <i><tt class="parameter">length</tt></i> characters away from the end of the string. In case <i><tt class="parameter">offset</tt></i> is also negative, the start position is calculated beforehand according to the rule explained above. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">charset</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">charset</tt></i> parameter is omitted, <i><tt class="parameter">string</tt></i> are assumed to be encoded in <a href="iconv.configuration.html" class="link">iconv.internal_encoding</a>. </p> <p class="para"> Note that <i><tt class="parameter">offset</tt></i> and <i><tt class="parameter">length</tt></i> parameters are always deemed to represent offsets that are calculated on the basis of the character set determined by <i><tt class="parameter">charset</tt></i>, whilst the counterpart <a href="function.substr.html" class="function">substr()</a> always takes these for byte offsets. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the portion of <i><tt class="parameter">str</tt></i> specified by the <i><tt class="parameter">offset</tt></i> and <i><tt class="parameter">length</tt></i> parameters. </p> <p class="para"> If <i><tt class="parameter">str</tt></i> is shorter than <i><tt class="parameter">offset</tt></i> characters long, <b><tt>FALSE</tt></b> will be returned. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.substr.html" class="function" rel="rdfs-seeAlso">substr()</a></li> <li class="member"><a href="function.mb-substr.html" class="function" rel="rdfs-seeAlso">mb_substr()</a></li> <li class="member"><a href="function.mb-strcut.html" class="function" rel="rdfs-seeAlso">mb_strcut()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.iconv-strrpos.html">iconv_strrpos</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.iconv.html">iconv</a></div> <div class="up"><a href="ref.iconv.html">iconv 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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