apply_filters( ‘is_protected_meta’, bool $protected, string $meta_key, string $meta_type )

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   Marcel Pol 9 years ago

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   Example of 2 meta fields that you want to set as protected:

   function my_meta_is_protected_meta( $protected, $meta_key, $meta_type ) {
           switch ($meta_key) {
                   case 'my_first_meta':
                           $protected = true;
                           break;
                   case 'my_second_meta':
                           $protected = true;
                           break;
           }
           return $protected;
   }
   add_filter( 'is_protected_meta', 'my_meta_is_protected_meta', 10, 3 );