PHP 字符截取 解决中文的截取问题,不用mb系列
2018-09-07 17:37
复制代码 代码如下:
function Cut_string($string, $start ,$sublen, $extstring=..., $code = UTF-8) {//Cut_string开始
if($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, $sublen)).$extstring;
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.= $extstring;
return $tmpstr;
}
} //Cut_string结束