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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 |
|---|---|
| 580 | if ( 'page' === $post_type ) { |
| 581 | |
| 582 | /** |
| 583 | * Filters the columns displayed in the Pages list table. |
| 584 | * |
| 585 | * @since 2.5.0 |
| 586 | * |
| 587 | * @param array $post_columns An array of column names. |
| 588 | */ |
| 589 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
| 590 | } else { |
| 591 | |
| 592 | /** |
| 593 | * Filters the columns displayed in the Posts list table. |
| 594 | * |
| 595 | * @since 1.5.0 |
| 596 | * |
| 597 | * @param array $posts_columns An array of column names. |
| 598 | * @param string $post_type The post type slug. |