brocheafoin

add_action( 'um_before_new_user_register', 'require_whitelisted_email_for_signup' );

function require_whitelisted_email_for_signup( $args ) {
	foreach ( [ 'yahoo.com', 'gmail.com', 'hotmail.com' ] as $domain ) {
		if ( str_ends_with( $args['user_email'], '@' . $domain ) ) {
			return true;
		}
	}
	exit( wp_safe_redirect( add_query_arg( 'err', 'blocked_domain' ) ) );
}

brocheafoin

add_action( 'um_before_new_user_register', 'require_whitelisted_email_for_signup' );

function require_whitelisted_email_for_signup( $args ) {
	$user_email       = $args['user_email'];
	$approved_domains = array( 'yahoo.com', 'gmail.com', 'hotmail.com' );
	$email_approved   = false;
	foreach ( $approved_domains as $domain ) {
		$prefixed_domain = '@' . $domain;
		if ( str_ends_with( $user_email, $prefixed_domain ) ) {
			$email_approved = true;

brocheafoin

/* TODO 
	Using the 'current_screen' hook means symlinks will be recreated *every time* a Codestyling Localization page is called.
	A better solution would be to store themes' versions in a site_option and run this only when installed versions are higher than what we have in our site_option (i.e. an update has been made). See here:
	http://make.wordpress.org/core/2010/10/27/plugin-activation-hooks-no-longer-fire-for-updates/
*/

add_action( 'current_screen' , 'uneq_cs_translations' );

function uneq_cs_translations( $current_screen ) {
	/* Re/Create symlinks when visiting Codestyling page */