php字符串截取函数,支持中英文混体

php字符串截取函数代码如下:

function cutstr($string, $sublen=10, $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++;

}//开源软件:phpfensi.com

//if(strlen($tmpstr)<$strlen ) $tmpstr.= "...";

return $tmpstr;

}

}