/**
  * Delete value from the database.
  *
  * @param  string $slug
  * @param  int    $post_id
  * @param  string $type
  *
  * @return bool
  */
 public function delete_value($slug, $post_id, $type)
 {
     $rows = intval(papi_get_property_meta_value($post_id, $slug));
     $value = $this->load_value($rows, $slug, $post_id);
     $value = papi_to_property_array_slugs($value, $slug);
     $result = true;
     foreach (array_keys($value) as $key) {
         $out = papi_delete_property_meta_value($post_id, $key, $type);
         $result = $out ? $result : $out;
     }
     return $result;
 }
 /**
  * Update value before it's saved to the database.
  *
  * @param mixed  $values
  * @param string $repeater_slug
  * @param int    $post_id
  *
  * @return array
  */
 public function update_value($values, $repeater_slug, $post_id)
 {
     $rows = intval(papi_get_property_meta_value($post_id, $repeater_slug));
     if (!is_array($values)) {
         $values = [];
     }
     list($results, $trash) = $this->get_results($rows, $repeater_slug, $post_id);
     // Delete trash values.
     foreach ($trash as $meta) {
         papi_delete_property_meta_value($post_id, $meta->meta_key);
     }
     $values = papi_to_property_array_slugs($values, $repeater_slug);
     foreach ($values as $slug => $value) {
         if (papi_is_property_type_key($slug)) {
             continue;
         }
         $property_type_slug = papi_get_property_type_key_f($slug);
         if (!isset($values[$property_type_slug])) {
             continue;
         }
         // Get real property slug
         $property_slug = $this->get_child_slug($repeater_slug, $slug);
         // Get property type
         $property_type_value = $values[$property_type_slug]->type;
         $property_type = papi_get_property_type($property_type_value);
         // Unserialize if needed.
         $value = papi_maybe_json_decode(maybe_unserialize($value));
         // Run update value on each property type class.
         $value = $property_type->update_value($value, $property_slug, $post_id);
         // Run update value on each property type filter.
         $values[$slug] = papi_filter_update_value($property_type_value, $value, $property_slug, $post_id, papi_get_meta_type());
         if (is_array($values[$slug])) {
             foreach ($values[$slug] as $key => $val) {
                 if (!is_string($key)) {
                     continue;
                 }
                 unset($values[$slug][$key]);
                 $key = preg_replace('/^\\_/', '', $key);
                 $values[$slug][$key] = $val;
             }
         }
     }
     // Find out which keys that should be deleted.
     $trash = array_diff(array_keys(papi_to_array($results)), array_keys(papi_to_array($values)));
     // Delete unwanted (trash) values.
     foreach (array_keys($trash) as $trash_key) {
         papi_delete_property_meta_value($post_id, $trash_key);
     }
     // It's safe to remove all rows in the database here.
     $this->remove_repeater_rows($post_id, $repeater_slug);
     // Remove unnecessary property type keys if any is left.
     foreach (array_keys($values) as $slug) {
         if (papi_is_property_type_key($slug)) {
             unset($values[$slug]);
         }
     }
     return $values;
 }