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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 |
|---|---|
| 829 | * |
| 830 | * This hook only fires if the current post type is hierarchical, |
| 831 | * such as pages. |
| 832 | * |
| 833 | * @since 2.5.0 |
| 834 | * |
| 835 | * @param string $column_name The name of the column to display. |
| 836 | * @param int $post_id The current post ID. |
| 837 | */ |
| 838 | do_action( 'manage_pages_custom_column', $column_name, $post->ID ); |
| 839 | } else { |
| 840 | |
| 841 | /** |
| 842 | * Fires in each custom column in the Posts list table. |
| 843 | * |
| 844 | * This hook only fires if the current post type is non-hierarchical, |
| 845 | * such as posts. |
| 846 | * |
| 847 | * @since 1.5.0 |