Undefined index: debuging error for theme option template snippet

Looking at your actual source, the relevant portion (with line numbers) is this:

745 if ( $_GET['page'] == basename(__FILE__) ) {
746 
747     if ( 'save' == $_REQUEST['action'] ) {
748
749         foreach ($options as $value) {
750             update_option( $value['id'], $_REQUEST[ $value['id'] ] ); }
751
752         foreach ($options as $value) {
753             if( isset( $_REQUEST[ $value['id'] ] ) ) { update_option( $value['id'], $_REQUEST[ $value['id'] ]  ); } else { delete_option( $value['id'] ); } }
754
755     header("Location: admin.php?page=admin-panel.php&saved=true");
756     die;
757
758 }

You’re checking for “page” inside the global $_GET variable, but in this case, it’s not set. You need to run an isset() check first.

745 if ( isset( $_GET['page'] ) && $_GET['page'] == basename(__FILE__) ) {

This will first check to see if we’ve passed in a value for ‘page’ in the request. If not, then we move on. If we have passed one in, though, then we’ll compare it to basename(__FILE__) as normal.

You should use this same isset() pattern with $_POST and $_REQUEST variables as well, otherwise you’ll get the same notices.

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