mysql 碰到特殊字符，造成了数据不全

header('Content-type: text/html;charset=utf-8');<br />$s = '6b6Z5Y2O8K+gpQ==';<br />echo $t = base64_decode($s), PHP_EOL;<br />echo bin2hex($t);

<br />header('Content-type: text/html;charset=utf-8');<br />$s = '6b6Z5Y2O8K+gpTEyMzEyMzEyMw==';<br />$t = base64_decode($s). PHP_EOL;<br />echo $t.'<br>';<br />echo filter_utf8_char($t);<br /><br />/** 過濾字符串,保留UTF8字母數字中文及部份符號 <br />*   @param  String  $ostr <br />*   @return String <br />*/  <br />function filter_utf8_char($ostr){  <br />    preg_match_all('/[\x{FF00}-\x{FFEF}<br><font color='#FF8000'>------解决思路----------------------</font><br>\x{0000}-\x{00ff}<br><font color='#FF8000'>------解决思路----------------------</font><br>\x{4e00}-\x{9fff}]+/u', $ostr, $matches);  <br />    $str = join('', $matches[0]);  <br />    if($str==''){   //含有特殊字符需要逐個處理  <br />        $returnstr = '';  <br />        $i = 0;  <br />        $str_length = strlen($ostr);  <br />        while ($i<=$str_length){  <br />            $temp_str = substr($ostr, $i, 1);  <br />            $ascnum = Ord($temp_str);  <br />            if ($ascnum>=224){  <br />                $returnstr = $returnstr.substr($ostr, $i, 3);  <br />                $i = $i + 3;  <br />            }elseif ($ascnum>=192){  <br />                $returnstr = $returnstr.substr($ostr, $i, 2);  <br />                $i = $i + 2;  <br />            }elseif ($ascnum>=65 && $ascnum<=90){  <br />                $returnstr = $returnstr.substr($ostr, $i, 1);  <br />                $i = $i + 1;  <br />            }elseif ($ascnum>=128 && $ascnum<=191){ // 特殊字符  <br />                $i = $i + 1;  <br />            }else{  <br />                $returnstr = $returnstr.substr($ostr, $i, 1);  <br />                $i = $i + 1;  <br />            }  <br />        }  <br />        $str = $returnstr;  <br />        preg_match_all('/[\x{FF00}-\x{FFEF}<br><font color='#FF8000'>------解决思路----------------------</font><br>\x{0000}-\x{00ff}<br><font color='#FF8000'>------解决思路----------------------</font><br>\x{4e00}-\x{9fff}]+/u', $str, $matches);  <br />        $str = join('', $matches[0]);  <br />    }  <br />    return $str;  <br />}  <br />