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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 |
|---|---|
| 599 | /** |
| 600 | * Filters the columns displayed in the Posts list table for a specific post type. |
| 601 | * |
| 602 | * The dynamic portion of the hook name, `$post_type`, refers to the post type slug. |
| 603 | * |
| 604 | * @since 3.0.0 |
| 605 | * |
| 606 | * @param array $post_columns An array of column names. |
| 607 | */ |
| 608 | return apply_filters( "manage_{$post_type}_posts_columns", $posts_columns ); |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * |
| 613 | * @return array |
| 614 | */ |
| 615 | protected function get_sortable_columns() { |
| 616 | return array( |
| 617 | 'title' => 'title', |