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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 |
|---|---|
| 719 | if ( 'page' === $post_type ) { |
| 720 | |
| 721 | /** |
| 722 | * Filters the columns displayed in the Pages list table. |
| 723 | * |
| 724 | * @since 2.5.0 |
| 725 | * |
| 726 | * @param string[] $post_columns An associative array of column headings. |
| 727 | */ |
| 728 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
| 729 | } else { |
| 730 | |
| 731 | /** |
| 732 | * Filters the columns displayed in the Posts list table. |
| 733 | * |
| 734 | * @since 1.5.0 |
| 735 | * |
| 736 | * @param string[] $post_columns An associative array of column headings. |
| 737 | * @param string $post_type The post type slug. |