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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 |
|---|---|
| 648 | if ( 'page' === $post_type ) { |
| 649 | |
| 650 | /** |
| 651 | * Filters the columns displayed in the Pages list table. |
| 652 | * |
| 653 | * @since 2.5.0 |
| 654 | * |
| 655 | * @param string[] $post_columns An associative array of column headings. |
| 656 | */ |
| 657 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
| 658 | } else { |
| 659 | |
| 660 | /** |
| 661 | * Filters the columns displayed in the Posts list table. |
| 662 | * |
| 663 | * @since 1.5.0 |
| 664 | * |
| 665 | * @param string[] $post_columns An associative array of column headings. |
| 666 | * @param string $post_type The post type slug. |