php中文字符串截取多种方法汇总

1.截取GB2312中文字符串<?php<?php//截取中文字符串functionmysubstr($str,$start,$len){$tmpstr="

1. 截取GB2312中文字符串

<?php
 
< ?php
//截取中文字符串
function mysubstr($str, $start, $len) {
 $tmpstr = "";
 $strlen = $start + $len;
 for($i = 0; $i < $strlen; $i++) {
 if(ord(substr($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

<?php
< ?php
//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

<?php
< ?php
/*
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
*/
 
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< $strlen; $i++)
 {
 if($i>=$start && $i< ($start+$sublen))
 {
 if(ord(substr($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)< $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

< ?php
/**
 * @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 <wwccss@263.net>
 * @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) < = $Length )
 {
 return $String;
 }
 else
 {
 $I = 0;
 while ($I < $Length)
 {
 $StringTMP = substr($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 = "17test.info 走在中国自动化测试的前沿";
$Length = "18";
$Append = false;
echo sysSubStr($String,$Length,$Append);
?>

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