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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 |
|---|---|
| 545 | if ( 'page' === $post_type ) { |
| 546 | |
| 547 | /** |
| 548 | * Filter the columns displayed in the Pages list table. |
| 549 | * |
| 550 | * @since 2.5.0 |
| 551 | * |
| 552 | * @param array $post_columns An array of column names. |
| 553 | */ |
| 554 | $posts_columns = apply_filters( 'manage_pages_columns', $posts_columns ); |
| 555 | } else { |
| 556 | |
| 557 | /** |
| 558 | * Filter the columns displayed in the Posts list table. |
| 559 | * |
| 560 | * @since 1.5.0 |
| 561 | * |
| 562 | * @param array $posts_columns An array of column names. |
| 563 | * @param string $post_type The post type slug. |