Code-Snippets-Functions/Execute a function on a child site/Gravity Forms/route-gravity-forms-notifications-by-way-usernames-email.txt

// Route Gravity Form notifications by way of usernames and email
// Format your Send to Email field in notifications as {usernames:user1:user2:user3} or {usernames:user1:user2}{emails:account@example.com}
add_filter( 'gform_notification', function ( $notification, $form, $entry ) {

   if ( strpos( $notification['to'], '{usernames' ) !== false || strpos( $notification['to'], '{emails' ) !== false ) {

      // parse the username and email batches
      $notification['to'] = str_replace( array( '} {', '},{' ), '}{', $notification['to'] );
      $batches = explode( '}{', substr( $notification['to'], 1, -1 ) );

      foreach ( $batches as $key => $batch ) {

         if ( strpos( $batch, 'usernames' ) !== false )
            $usernames = explode( ':', $batch );

         if ( strpos( $batch, 'emails' ) !== false )
            $emails = explode( ':', $batch );

      }

      $to = array(); // initialize the to array

      // loop through users and grab the email
      if ( isset( $usernames ) ) {

         unset( $usernames[0] );

         foreach ( $usernames as $username ) {

            $user = get_user_by( 'login', $username );

            if ( $user !== false )
               $to[] = $user->user_email;

         }

      }

      // loop through the email addresses
      if ( isset( $emails ) ) {

         unset( $emails[0] );

         foreach ( $emails as $email ) {
            $to[] = $email;
         }

      }

      // add all addresses to the notification
      $notification['to'] = implode( ',', $to );

   }

   return $notification;

}, 10, 3 );