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        /**
	 * 生成"dasf..."形式字符串
	 *
	 * @param string $string 字符源
	 * @param int $strlen  获取字符长度
	 * @return string
	 */
	function shortFor($string, $strlen = 20, $etc = '...', $keep_first_style = false){
 
	    $strlen = $strlen*3;
	    $string = trim($string);
	    if ( strlen($string) <= $strlen ) {
	        return $string;
	    }
	    $str = strip_tags($string);
	    $j = 0;
 
	    for($i=0;$i<$strlen;$i++) {
	        if(ord(substr($str,$i,1))>0xa0){ $i+=2; $j+=3;}
	        else {$j++;}
	    }
	    $rstr=substr($str,0,$j);
	    if (strlen($str)>$strlen ) {$rstr .= $etc;}
 
 
	    if ( $keep_first_style == true && ereg('^<(.*)>$',$string) )    {
	        if ( strlen($str) <= $strlen )    {
	            return $string;
	        }
	        $start_pos = strpos($string,substr($str,0,4));
	        $end_pos = strpos($string,substr($str,-4));
	        $end_pos = $end_pos+4;
	        $rstr = substr($string,0,$start_pos) . $rstr . substr($string,$end_pos,strlen($string));
	    }
	    return $rstr;
	}