5dhWBxXJ

1add_filter( 'gform_field_validation', 'PREFIX_gravity_forms_blacklist', 10, 4 );
2/**
3 * Added Validation check for email vs blacklist of free email accounts.
4 *
5 * @param $result array         The validation result to be filtered
6 * @param $value  string|array  The field value to be validated
7 * @param $form   object        Current Form object
8 * @param $field  object        Current Field object
9 *
10 * @return mixed
11 */
12function PREFIX_gravity_forms_blacklist( $result, $value, $form, $field ) {
13	if ( $field->get_input_type() === 'email' && $result['is_valid'] ) {
14
15		$domain    = explode( '@', $value );
16		$blacklist = array(
17			'gmail.com',
18			'yahoo.com',
19			'hotmail.com'
20		);
21
22		if ( in_array( $domain[1], $blacklist ) ) {
23			$result['is_valid'] = false;
24			$result['message']  = 'Please use a work email.';
25		}
26	}
27
28	return $result;
29}