Cannot Get User id after login success in file wp_login.php

Question

I have a problem when I want to get user id WordPress after login in file wp_login.php, I tried to insert some code in this file, after line wp_safe_redirect($redirect_to); in login case.

I must get user id after login to update my custom WordPress table.

session_start();
require( dirname(__FILE__) . '/wp-load.php' );
global $wpdb;

$session_id     = session_id(); 
$current_user   = wp_get_current_user();
$id_user        = $current_user->ID;

$wpdb->query( 
    $wpdb->prepare("UPDATE wp_shortlist SET id_user='$id_user' WHERE id_session='$session_id' ")
);

any idea to get user id after login in file wp_login.php?

Answer 1

As said above modifying the core files is a bad idea, by doing so you are opening up security holes and on top of all this you loose the changes made on up-gradation.

To do the above you can try the wp_login hook, put the codes in your active theme's functions.php

function after_login() {
    $current_user = wp_get_current_user();
    $id_user = $current_user->ID;
       // The query you were trying would go here.
}
add_action( 'wp_login', 'after_login' );

Hope it helps !