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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 480 | * @since 2.1.0 |
| 481 | * @since 4.4.0 The `$post_type` parameter was added. |
| 482 | * @since 4.6.0 The `$which` parameter was added. |
| 483 | * |
| 484 | * @param string $post_type The post type slug. |
| 485 | * @param string $which The location of the extra table nav markup: |
| 486 | * 'top' or 'bottom' for WP_Posts_List_Table, |
| 487 | * 'bar' for WP_Media_List_Table. |
| 488 | */ |
| 489 | do_action( 'restrict_manage_posts', $this->screen->post_type, $which ); |
| 490 | |
| 491 | $output = ob_get_clean(); |
| 492 | |
| 493 | if ( ! empty( $output ) ) { |
| 494 | echo $output; |
| 495 | submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'post-query-submit' ) ); |
| 496 | } |
| 497 | } |
| 498 | |