php中截取中文字符串的代码小结_php技巧

字符串截取是一个非常常见的编程任务，而往往带中文的字符串截取会经常用到。虽然不难，但是自己写函数实现又耗费时间，这里介绍一个比较好用的字符串截取函数，能够胜任基本的需求了。

1. 截取GB2312中文字符串

 <BR>< ?php <BR>//截取中文字符串 <BR>function mysubstr($str, $start, $len) { <BR>$tmpstr = ""; <BR>$strlen = $start + $len; <BR>for($i = 0; $i < $strlen; $i++) { <BR>if(ord(substr($str, $i, 1)) > 0xa0) { <BR>$tmpstr .= substr($str, $i, 2); <BR>$i++; <BR>} else <BR>$tmpstr .= substr($str, $i, 1); <BR>} <BR>return $tmpstr; <BR>} <BR>?> <BR>

2. 截取utf8编码的多字节字符串

 <BR>< ?php <BR>//截取utf8字符串 <BR>function utf8Substr($str, $from, $len) <BR>{ <BR>return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'. <BR>'((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s', <BR>'$1',$str); <BR>} <BR>?> <BR>

3. UTF-8、GB2312都支持的汉字截取函数

 <BR>< ?php <BR>/* <BR>Utf-8、gb2312都支持的汉字截取函数 <BR>cut_str(字符串, 截取长度, 开始长度, 编码); <BR>编码默认为 utf-8 <BR>开始长度默认为 0 <BR>*/ <BR>function cut_str($string, $sublen, $start = 0, $code = 'UTF-8') <BR>{ <BR>if($code == 'UTF-8') <BR>{ <BR>$pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"; <BR>preg_match_all($pa, $string, $t_string); <BR>if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."..."; <BR>return join('', array_slice($t_string[0], $start, $sublen)); <BR>} <BR>else <BR>{ <BR>$start = $start*2; <BR>$sublen = $sublen*2; <BR>$strlen = strlen($string); <BR>$tmpstr = ''; <BR>for($i=0; $i< $strlen; $i++) <BR>{ <BR>if($i>=$start && $i< ($start+$sublen)) <BR>{ <BR>if(ord(substr($string, $<i>·本2文来源gaodai$ma#com搞$代*码网2</i><strong>搞gaodaima代码</strong>i, 1))>129) <BR>{ <BR>$tmpstr.= substr($string, $i, 2); <BR>} <BR>else <BR>{ <BR>$tmpstr.= substr($string, $i, 1); <BR>} <BR>} <BR>if(ord(substr($string, $i, 1))>129) $i++; <BR>} <BR>if(strlen($tmpstr)< $strlen ) $tmpstr.= "..."; <BR>return $tmpstr; <BR>} <BR>} <BR>$str = "abcd需要截取的字符串"; <BR>echo cut_str($str, 8, 0, 'gb2312'); <BR>?> <BR>

4. BugFree 的字符截取函数

 <BR>< ?php <BR>/** <BR>* @package BugFree <BR>* @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $ <BR>* <BR>* <BR>* Return part of a string(Enhance the function substr()) <BR>* <BR>* @author Chunsheng Wang  <BR>* @param string $String the string to cut. <BR>* @param int $Length the length of returned string. <BR>* @param booble $Append whether append "...": false|true <BR>* @return string the cutted string. <BR>*/ <BR>function sysSubStr($String,$Length,$Append = false) <BR>{ <BR>if (strlen($String) < = $Length ) <BR>{ <BR>return $String; <BR>} <BR>else <BR>{ <BR>$I = 0; <BR>while ($I < $Length) <BR>{ <BR>$StringTMP = substr($String,$I,1); <BR>if ( ord($StringTMP) >=224 ) <BR>{ <BR>$StringTMP = substr($String,$I,3); <BR>$I = $I + 3; <BR>} <BR>elseif( ord($StringTMP) >=192 ) <BR>{ <BR>$StringTMP = substr($String,$I,2); <BR>$I = $I + 2; <BR>} <BR>else <BR>{ <BR>$I = $I + 1; <BR>} <BR>$StringLast[] = $StringTMP; <BR>} <BR>$StringLast = implode("",$StringLast); <BR>if($Append) <BR>{ <BR>$StringLast .= "..."; <BR>} <BR>return $StringLast; <BR>} <BR>} <BR>$String = "17test.info 走在中国自动化测试的前沿"; <BR>$Length = "18"; <BR>$Append = false; <BR>echo sysSubStr($String,$Length,$Append); <BR>?> <BR>

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