last_insert:_id always returns 0 - php

Question

In PHP the MySQL method (like the PDO::lastInertID()) always returns 0 whereas MySQL returns in properly.
I tried try-catch, object initialization, but didn't work.
abstract class Database
{
private static $host = "localhost";
private static $dbname = "loquor";
private static $charset = "utf8";
private static $dbType = "mysql";
private static $dbUsername = "root";
private static $dbPassword = "";
private static function connect ()
{
$dsn = self::$dbType . ":host=" . self::$host . ";dbname=" . self::$dbname . ";charset=" . self::$charset;
$connex = new PDO( $dsn, self::$dbUsername, self::$dbPassword );
$connex->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
return $connex;
}
public static function query ($query, $params = [], $lastInsertID = false)
{
if(!$lastInsertID)
{
$statement = self::connect()->prepare($query);
$statement->setFetchMode(\PDO::FETCH_OBJ);
$statement->execute( $params );
}
else
{
if (explode ( " ", $query )[0] === "INSERT")
{
$statement = self::connect()->query($query);
$x = self::connect()->query("SELECT LAST_INSERT_ID() AS L")->fetch()['L'];
echo $x; //always 0
}
}
if (explode (" ", $query )[0] === "SELECT")
return $statement;
}
}
Database::query("INSERT INTO test(name) VALUES ('test_name') ", [], true));
Returns 0.