收集了php中截取字符串函数

本文章是收集了几个常用的字符串截取函数，这是解决了php中对各种编码的字符截取会乱码的问题，有需要的同学可以参考一一下。

截取GB2312中文字符串

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

2. 截取utf8编码的多字节字符串

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

3. UTF-8、GB2312都支持的汉字截取函数

/*

Utf-8、gb2312都支持的汉字截取函数

cut_str(字符串, 截取长度, 开始长度, 编码);

编码默认为 utf-8

开始长度默认为 0

*/

代码如下

复制代码

function cut_str($string, $sublen, $start = 0, $code = 'UTF-8') { if($code == 'UTF-8') { $pa = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/"; preg_match_all($pa, $string, $t_string);   if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."..."; return join('', array_slice($t_string[0], $start, $sublen)); } else { $start = $start*2; $sublen = $sublen*2; $strlen = strlen($string); $tmpstr = '';   for($i=0; $i { if($i>=$start && $i { if(ord(substr($string, $i, 1))>129) { $tmpstr.= substr($string, $i, 2); } else { $tmpstr.= substr($string, $i, 1); } } if(ord(substr($string, $i, 1))>129) $i++; } if(strlen($tmpstr) return $tmpstr; } }   $str = "abcd需要截取的字符串"; echo cut_str($str, 8, 0, 'gb2312'); ?>

4. BugFree 的字符截取函数

代码如下

复制代码

/** * @package BugFree * @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $ * * * Return part of a string(Enhance the function substr()) * * @author Chunsheng Wang * @param string $String the string to cut. * @param int $Length the length of returned string. * @param booble $Append whether append "...": false|true * @return string the cutted string. */ function sysSubStr($String,$Length,$Append = false) { if (strlen($String) { return $String; } else { $I = 0; while ($I { $StringTMP = substr($String,$I,1); if ( ord($StringTMP) >=224 ) { $StringTMP = substr($String,$I,3); $I = $I + 3; } elseif( ord($StringTMP) >=192 ) { $StringTMP = substr($String,$I,2); $I = $I + 2; } else { $I = $I + 1; } $StringLast[] = $StringTMP; } $StringLast = implode("",$StringLast); if($Append) { $StringLast .= "..."; } return $StringLast; } }   $String = "php100.com-- 简单、精彩、通用"; $Length = "18"; $Append = false; echo sysSubStr($String,$Length,$Append); ?>