MemberPress: Restrict Email Patterns for Specific Memberships

function mepr_restrict_email_patterns_for_specific_plans($errors) {

    // Define the patterns to search for in email addresses

    $blocked_email_patterns = array( 'xxx@gmail', 'xyz@', 'test@test' );

    // Define specific subscription plan IDs that require email restriction

    $restricted_plan_ids = array( 123, 456 ); // Replace with actual plan IDs

    // Retrieve the email address and membership ID from the form submission

    $email_address = isset( $_POST[ 'user_email' ] ) ? sanitize_email( trim( $_POST[ 'user_email' ] ) ) : '';

    $membership_id = isset( $_POST[ 'mepr_product_id' ] ) ? intval( $_POST[ 'mepr_product_id' ] ) : 0;

    // Check if the user is registering for a restricted plan

    if ( in_array( $membership_id, $restricted_plan_ids ) ) {

        // Check if the email contains any of the blocked patterns

        foreach ( $blocked_email_patterns as $pattern ) {

            if ( strpos( $email_address, $pattern ) !== false ) {

                $errors[] = 'Email addresses containing certain patterns are not allowed for this plan.';

                return $errors;

            }

        }

    }

    return $errors;

}

add_filter( 'mepr-validate-signup', 'mepr_restrict_email_patterns_for_specific_plans' );