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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 |
|---|---|
| 702 | if ( 'page' === $post_type ) { |
| 703 | |
| 704 | /** |
| 705 | * Filters the columns displayed in the Pages list table. |
| 706 | * |
| 707 | * @since 2.5.0 |
| 708 | * |
| 709 | * @param string[] $post_columns An associative array of column headings. |
| 710 | */ |
| 711 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
| 712 | } else { |
| 713 | |
| 714 | /** |
| 715 | * Filters the columns displayed in the Posts list table. |
| 716 | * |
| 717 | * @since 1.5.0 |
| 718 | * |
| 719 | * @param string[] $post_columns An associative array of column headings. |
| 720 | * @param string $post_type The post type slug. |