Introduction¶

By default (post, settings, customizer, term and other) options are saved all in one place in database, in a wp_option or any other location. In some cases you need an option to be saved in a separate wp_option or post meta or some custom location in database, for example Mailer settings option-type is saved in one wp_option and the same value is used in all Contact Forms. This custom saving behavior is achieved via the fw-storage option parameter, it has the following structure:

'option_id' => array(
    'type' => 'any-type',

    'fw-storage' => array(
        'type' => 'valid-storage-type',
        // additional parameters of the used storage type
    ),
)

When options are saved and loaded from database all their fw-storage parameters are processed.

Predefined types¶

Here are some examples with default storage types:

1. To save an option in a separate wp_option:

   'demo-option-id' => array(
       'type' => 'text',
   
       'fw-storage' => array(
           'type' => 'wp-option',
           'wp-option' => 'demo_wp_option',
       ),
   )
   

   Add the above option array in post, settings, customizer or term options, save the form and check the database wp_options table for an option named demo_wp_option.

   Additional parameters can be found here.

2. To save an option in a separate post meta:

   'demo-option-id' => array(
       'type' => 'text',
   
       'fw-storage' => array(
           'type' => 'post-meta',
           'post-meta' => 'demo_post_meta',
       ),
   )
   

   Add the above option array in post options, edit a post and check the database wp_postmeta table for a meta named demo_post_meta.

   Additional parameters can be found here.

Custom Types¶

It’s possible to register new storage types.

1. Create your class in a separate file and extend the FW_Option_Storage_Type class.

   Let’s say the file is {theme}/class-fw-option-storage-type-demo.php.

   class FW_Option_Storage_Type_Demo extends FW_Option_Storage_Type {
       public function get_type() {
           return 'demo';
       }
   
       protected function _load($id, array $option, $value, array $params) {
           if ($param_id = $this->get_parameter_value($id, $option, $params)) {
               // the parameter was specified
               return $this->load_value($param_id);
           } else {
               // do nothing, return the current value
               return $value;
           }
       }
   
       protected function _save($id, array $option, $value, array $params) {
           if ($param_id = $this->get_parameter_value($id, $option, $params)) {
               $this->save_value($param_id, $value);
   
               // do not return current value to prevent duplicate and useless memory usage
               // return empty default option-type value
               return fw()->backend->option_type($option['type'])->get_value_from_input(
                   array('type' => $option['type']), null
               );
           } else {
               // do nothing, return the current value
               return $value;
           }
       }
   
       /**
        * Check and extract the identification parameter
        * @param string $id
        * @param array $option
        * @param array $params
        * @return string|bool
        */
       private function get_parameter_value($id, $option, $params) {
           if (isset($option['fw-storage']['demo-id'])) {
               return $option['fw-storage']['demo-id'];
           } else {
               return false;
           }
       }
   
       private function load_value($param_id) {
           // Load the value from your custom location (a wp_option, a custom table, etc.)
           $value = 'Hello World'; // ...
   
           return $value;
       }
   
       private function save_value($param_id, $value) {
           // Save the value to your custom location...
       }
   }
   

   Note

   The class implementation is simplified just to give you an idea of how it works. For a complete implementation inspect the predefined types.

2. Register your custom type. Add in {theme}/functions.php:

   add_action(
       'fw:option-storage-types:register',
       '_action_theme_custom_fw_storage_types'
   );
   function _action_theme_custom_fw_storage_types($register) {
       require_once dirname(__FILE__) .'/class-fw-option-storage-type-demo.php';
       $register->register(new FW_Option_Storage_Type_Demo());
   }
   

3. Use your custom type in any option:

   'some-option-id' => array(
       'type' => 'text',
   
       'fw-storage' => array(
           'type' => 'demo', // Must match FW_Option_Storage_Type_Demo::get_type()
           'demo-id' => 'lorem-ipsum', // This is used by FW_Option_Storage_Type_Demo::get_parameter_value()
       ),
   )