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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 |
|---|---|
| 569 | * @since 2.1.0 |
| 570 | * @since 4.4.0 The `$post_type` parameter was added. |
| 571 | * @since 4.6.0 The `$which` parameter was added. |
| 572 | * |
| 573 | * @param string $post_type The post type slug. |
| 574 | * @param string $which The location of the extra table nav markup: |
| 575 | * 'top' or 'bottom' for WP_Posts_List_Table, |
| 576 | * 'bar' for WP_Media_List_Table. |
| 577 | */ |
| 578 | do_action( 'restrict_manage_posts', $this->screen->post_type, $which ); |
| 579 | |
| 580 | $output = ob_get_clean(); |
| 581 | |
| 582 | if ( ! empty( $output ) ) { |
| 583 | echo $output; |
| 584 | submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'post-query-submit' ) ); |
| 585 | } |
| 586 | } |
| 587 | |