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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 |
---|---|
676 | /** |
677 | * Filters the columns displayed in the Posts list table for a specific post type. |
678 | * |
679 | * The dynamic portion of the hook name, `$post_type`, refers to the post type slug. |
680 | * |
681 | * @since 3.0.0 |
682 | * |
683 | * @param string[] $post_columns An associative array of column headings. |
684 | */ |
685 | return apply_filters( "manage_{$post_type}_posts_columns", $posts_columns ); |
686 | } |
687 |
|
688 | /** |
689 | * @return array |
690 | */ |
691 | protected function get_sortable_columns() { |
692 | return array( |
693 | 'title' => 'title', |
694 | 'parent' => 'parent', |