如何检查变量是否应转到blob数据类型

Question

I have a generic function of php to insert data into mysql.

public static function query($sql) {
    self::CONNECT ();


    $numargs = func_num_args ();
    $arg_list = func_get_args ();
    //start from 1st parameter as 0th parameter is the query

    for($i = 1; $i < $numargs; $i ++) {
        //echo $arg_list[$i]." - ";
        if (is_int ( $arg_list [$i] )) {
            $query->bindParam ( $i, $arg_list [$i], PDO::PARAM_INT );
        } else {
            $query->bindParam ( $i, $arg_list [$i], PDO::PARAM_STR );
        }
    }


    $query->execute ();

    return $query;
}

Here I was wondering how can I check if the given argument is a for a BLOB data type? So that I can give it PDO::PARAM_LOB while calling bindParam