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);
?>
http://www.bkjia.com/phpjc/444714.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/444714.htmltecharticle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...