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<?php |
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namespace Amarkal\Taxonomy; |
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/** |
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* WordPress taxonomy form utilities |
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*/ |
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class Form |
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{ |
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/** |
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* @var Singleton The reference to *Singleton* instance of this class |
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*/ |
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private static $instance; |
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/** |
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* @var Array Stores a form for each taxonomy |
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*/ |
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private $forms = array(); |
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/** |
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* Returns the *Singleton* instance of this class. |
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* |
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* @return Singleton The *Singleton* instance. |
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*/ |
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public static function get_instance() |
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{ |
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if( null === static::$instance ) |
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{ |
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static::$instance = new static(); |
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} |
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return static::$instance; |
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} |
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/** |
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* Add a form field to both the add & edit forms for a given taxonomy. |
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* |
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* @param string $taxonomy_name |
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* @param array $component |
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* @throws \RuntimeException if duplicate names are registered under the same taxonomy |
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*/ |
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public function add_field( $taxonomy_name, $component ) |
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{ |
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if( !isset($this->forms[$taxonomy_name]) ) |
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{ |
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// Add fields to taxonomy add and edit forms |
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add_action( "{$taxonomy_name}_add_form_fields", array($this, 'render_add_form') ); |
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add_action( "{$taxonomy_name}_edit_form_fields", array($this, 'render_edit_form') ); |
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// Save the data from taxonomy add and edit forms |
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add_action( "create_{$taxonomy_name}", array($this, 'update_term') ); |
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add_action( "edited_{$taxonomy_name}", array($this, 'update_term') ); |
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// Modify the taxonomy term table |
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add_filter( "manage_edit-{$taxonomy_name}_columns", array($this, 'modify_table_columns') ); |
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add_filter( "manage_{$taxonomy_name}_custom_column", array($this, 'modify_table_content'), 10, 3 ); |
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add_filter( "manage_edit-{$taxonomy_name}_sortable_columns", array($this, 'modify_table_sortable_columns') ); |
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add_filter( 'terms_clauses', array($this, 'sort_custom_column'), 10, 3 ); |
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$this->forms[$taxonomy_name] = new \Amarkal\UI\Form(); |
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} |
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$this->forms[$taxonomy_name]->add_component( |
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array_merge( $this->default_props(), $component ) |
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); |
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} |
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/** |
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* Render the 'edit term' form for a given taxonomy |
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* |
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* @param object $term Taxonomy term |
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*/ |
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public function render_edit_form( $term ) |
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{ |
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$form = $this->forms[$term->taxonomy]; |
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$new_instance = array(); |
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foreach( $form->get_components() as $component ) |
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{ |
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$new_instance[$component->name] = \get_term_meta($term->term_id, $component->name, true); |
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} |
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$form->update($new_instance); |
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include __DIR__.'/EditForm.phtml'; |
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} |
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/** |
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* Render the 'add new term' form for a given taxonomy |
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* |
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* @param string $taxonomy Taxonomy name |
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*/ |
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public function render_add_form( $taxonomy ) |
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{ |
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$form = $this->forms[$taxonomy]; |
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$form->update(); |
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include __DIR__.'/AddForm.phtml'; |
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} |
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/** |
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* Update the meta values for a given term. Called once one of the add/edit |
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* forms is saved. |
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* |
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* @param type $term_id |
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*/ |
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function update_term( $term_id ) |
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{ |
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$term = \get_term( $term_id ); |
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foreach( $this->forms[$term->taxonomy]->get_components() as $component ) |
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{ |
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$term_meta = filter_input(INPUT_POST, $component->name); |
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if( null !== $term_meta ) |
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{ |
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\update_term_meta($term_id, $component->name, $term_meta); |
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} |
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} |
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} |
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/** |
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* Add additional columns to the term table. |
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* |
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* @param array $columns |
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* @return array |
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*/ |
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View Code Duplication |
function modify_table_columns( $columns ) |
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{ |
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$this->traverse_components(function( $taxonomy, $component ) use ( &$columns ) |
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{ |
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if( $component->table['show'] ) |
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{ |
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$columns[$component->name] = $component->title; |
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} |
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}); |
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return $columns; |
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} |
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/** |
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* Retrieve the data for a given column in the term table. |
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* |
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* @see https://developer.wordpress.org/reference/hooks/manage_this-screen-taxonomy_custom_column/ |
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* |
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* @param type $content |
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* @param type $column_name |
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* @param type $term_id |
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* @return type |
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*/ |
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function modify_table_content( $content, $column_name, $term_id ) |
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{ |
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$term = \get_term($term_id); |
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$this->traverse_components(function( $taxonomy, $component ) use ( &$content, $column_name, $term ) |
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{ |
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if( $component->table['show'] && |
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$term->taxonomy === $taxonomy && |
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$component->name === $column_name |
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) { |
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$content = \get_term_meta($term->term_id, $component->name, true); |
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} |
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}); |
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return $content; |
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} |
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/** |
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* Make custom table columns sortable. |
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* |
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* @param array $columns |
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* @return string |
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*/ |
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View Code Duplication |
function modify_table_sortable_columns( $columns ) |
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{ |
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$this->traverse_components(function( $taxonomy, $component ) use ( &$columns ) |
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{ |
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if( $component->table['show'] && |
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$component->table['sortable'] |
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) { |
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$columns[$component->name] = $component->name; |
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} |
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}); |
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return $columns; |
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} |
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/** |
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* Modify terms_clauses to allow sorting custom WordPress Admin Table Columns by a custom Taxonomy Term meta |
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* |
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* @see https://developer.wordpress.org/reference/hooks/terms_clauses/ |
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* |
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* @global type $wpdb |
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* @param type $clauses |
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* @param type $taxonomies |
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* @param type $args |
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* @return string |
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*/ |
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public function sort_custom_column( $clauses, $taxonomies, $args ) |
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{ |
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$this->traverse_components(function( $taxonomy, $component ) use ( &$clauses, $args ) |
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{ |
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if( in_array($taxonomy, $args['taxonomy']) && |
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$component->table['sortable'] && |
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$component->name === $args['orderby'] |
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) |
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{ |
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global $wpdb; |
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// tt refers to the $wpdb->term_taxonomy table |
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$clauses['join'] .= " LEFT JOIN {$wpdb->termmeta} AS tm ON t.term_id = tm.term_id"; |
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$clauses['where'] = "tt.taxonomy = '{$taxonomy}' AND (tm.meta_key = '{$component->name}' OR tm.meta_key IS NULL)"; |
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$clauses['orderby'] = "ORDER BY tm.meta_value"; |
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} |
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}); |
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return $clauses; |
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} |
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/** |
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* The default form field properties. This is merged with the user given |
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* properties. When the component is rendered, this will be merged with the |
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* component's properties as well. |
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* |
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* @return array |
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*/ |
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private function default_props() |
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{ |
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return array( |
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'type' => null, |
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'title' => null, |
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'description' => null, |
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'table' => array( |
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'show' => false, |
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'sortable' => false |
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) |
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); |
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} |
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/** |
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* Treverse the $fields array. |
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* |
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* @param collable $callback Called on each iteration |
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*/ |
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private function traverse_components( $callback ) |
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{ |
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foreach( $this->forms as $taxonomy => $form ) |
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{ |
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foreach( $form->get_components() as $component ) |
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{ |
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$callback( $taxonomy, $component ); |
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} |
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} |
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} |
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} |
Let’s assume you have a class which uses late-static binding:
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()
on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClass
to useself
instead: