截取中英文字符函数

中英文字符截取

<?php 
    /**
     * 截取中英文字符
     * Enter description here ...
     * @param unknown_type $str
     * @param unknown_type $start
     * @param unknown_type $length
     * @param unknown_type $charset
     * @param unknown_type $suffix
     * @return unknown|string
     */
    public static function csubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)
    {
    	if(function_exists("mb_substr"))
    	{
    		if(mb_strlen($str, $charset) <= $length) return $str;
    		$slice = mb_substr($str, $start, $length, $charset);
    	} else {
    		$re["utf-8"]   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
    		$re["gb2312"] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
    		$re["gbk"]          = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
    		$re["big5"]          = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
    		preg_match_all($re[$charset], $str, $match);
    		if(count($match[0]) <= $length) return $str;
    		$slice = join("",array_slice($match[0], $start, $length));
    	}
    	if($suffix) return $slice."…";
    	return $slice;
    }
?>

调用方法：

<?php echo  Url::csubstr($title, 0, 15);?>