public function generateMaskingKey() {
        $mask = '';

        for ($i = 1; $i <= static::MASK_LENGTH; $i++) {
            $mask .= chr(rand(32, 126));
        }

        return $mask;
    }
public function generateMaskingKey() {
        $mask = '';

        for ($i = 1; $i <= static::MASK_LENGTH; $i++) {
            $mask .= chr(rand(32, 126));
        }

        return $mask;
    }
public function generateMaskingKey ( ) { $ mask = '' ; for ( $ i = 1 ; $ i <= static :: MASK_LENGTH ; $ i ++ ) { $ mask .= chr ( rand ( 32 , 126 ) ) ; } return $ mask ; }
Create a 4 byte masking key
@return string
Create a 4 byte masking key