function yz_expression()

{

		foreach ($_POST as $key => &$value) {

		$value = preg_replace_callback('/[\xf0-\xf7].{3}/', function($r) { return '@E' . base64_encode($r[0]);},$value);

			$countt=substr_count($value,"@");

			for ($i=0; $i < $countt; $i++) {

				$c = stripos($value,"@");

				$value=substr($value,0,$c).substr($value,$c+10,strlen($value)-1);

			}

			$value = preg_replace_callback('/@E(.{6}==)/', function($r) {return base64_decode($r[1]);}, $value);

		}

		return $_POST;

}

/**

     * 替换掉数组中的emoji表情

     * @param $arrayString

     * @param string $replaceTo

     * @return mixed|string

     */

    public static function filterEmojiDeep($arrayString,$replaceTo = '?')

    {

        if(is_string($arrayString))

        {

            return self::filterEmoji($arrayString,$replaceTo);

        }

        else if(is_array($arrayString))

        {

            foreach($arrayString as &$array)

            {

                if(is_array($array) || is_string($array))

                {

                    $array = self::filterEmojiDeep($array,$replaceTo);

                }

                else

                {

                    $array = $array;

                }

            }

        }

        return $arrayString;

    }

/**

     * 替换掉emoji表情

     * @param $text

     * @param string $replaceTo

     * @return mixed|string

     */

    public static function filterEmoji($text, $replaceTo = '?')

    {

        $clean_text = "";

        // Match Emoticons

        $regexEmoticons = '/[\x{1F600}-\x{1F64F}]/u';

        $clean_text = preg_replace($regexEmoticons, $replaceTo, $text);

        // Match Miscellaneous Symbols and Pictographs

        $regexSymbols = '/[\x{1F300}-\x{1F5FF}]/u';

        $clean_text = preg_replace($regexSymbols, $replaceTo, $clean_text);

        // Match Transport And Map Symbols

        $regexTransport = '/[\x{1F680}-\x{1F6FF}]/u';

        $clean_text = preg_replace($regexTransport, $replaceTo, $clean_text);

        // Match Miscellaneous Symbols

        $regexMisc = '/[\x{2600}-\x{26FF}]/u';

        $clean_text = preg_replace($regexMisc, $replaceTo, $clean_text);

        // Match Dingbats

        $regexDingbats = '/[\x{2700}-\x{27BF}]/u';

        $clean_text = preg_replace($regexDingbats, $replaceTo, $clean_text);

        return $clean_text;

    }