PHP WordPress – Check User Existence CLI

require(dirname(__DIR__) . '/html/wp-config.php');

$email = 'test@test.tld';
$user_data = get_user_by( 'email', $email ); // return WP_User object otherwise return false if not found 
if ( empty( $user_data ) ) {	
	echo "\nNo user exists with this email address\n";
}
else
{
echo "\nUser exists with this email address\n";

}

require(dirname(__DIR__) . '/html/wp-config.php');

$user_login = 'admin';
$user_data = get_user_by( 'login', $user_login ); // return WP_User object otherwise return false if not found 
if ( empty( $user_data ) ) {	
	echo "\nNo user exists with this user login\n";
}
else
{
echo "\nUser exists with this user login\n";
}