How To Log-in A WordPress User

Using the following snippet in your theme’s functions.php file, you will be able to log-in a WordPress user programmatically.

function auto_login( $user ) {
    $username = $user;
    if ( !is_user_logged_in() ) {
        $user = get_userdatabylogin( $username );
        $user_id = $user->ID;
        wp_set_current_user( $user_id, $user_login );
        wp_set_auth_cookie( $user_id );
        do_action( 'wp_login', $user_login );
    }
}
Once done, now to log-in a user, just simply do the following:
auto_login( 'admin' )

function auto_login( $user ) {

$username = $user;

if ( !is_user_logged_in() ) {

$user = get_userdatabylogin( $username );

$user_id = $user->ID;

wp_set_current_user( $user_id, $user_login );

wp_set_auth_cookie( $user_id );

do_action( 'wp_login', $user_login );

}

Once done, now to log-in a user, just simply do the following:

auto_login( 'admin' )

Snippet Source/Credit: emoticode

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