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	function filter_utf8_char($ostr){
	    preg_match_all('/[\x{FF00}-\x{FFEF}|\x{0000}-\x{00ff}|\x{4e00}-\x{9fff}]+/u', $ostr, $matches);
	    $str = join('', $matches[0]);
	    if($str==''){   //含有特殊字符需要逐個處理
	        $returnstr = '';
	        $i = 0;
	        $str_length = strlen($ostr);
	        while ($i<=$str_length){
	            $temp_str = substr($ostr, $i, 1);
	            $ascnum = Ord($temp_str);
	            if ($ascnum>=224){
	                $returnstr = $returnstr.substr($ostr, $i, 3);
	                $i = $i + 3;
	            }elseif ($ascnum>=192){
	                $returnstr = $returnstr.substr($ostr, $i, 2);
	                $i = $i + 2;
	            }elseif ($ascnum>=65 && $ascnum<=90){
	                $returnstr = $returnstr.substr($ostr, $i, 1);
	                $i = $i + 1;
	            }elseif ($ascnum>=128 && $ascnum<=191){ // 特殊字符
	                $i = $i + 1;
	            }else{
	                $returnstr = $returnstr.substr($ostr, $i, 1);
	                $i = $i + 1;
	            }
	        }
	        $str = $returnstr;
	        preg_match_all('/[\x{FF00}-\x{FFEF}|\x{0000}-\x{00ff}|\x{4e00}-\x{9fff}]+/u', $str, $matches);
	        $str = join('', $matches[0]);
	    }
	    return $str;
	}