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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 |
|---|---|
| 843 | * |
| 844 | * This hook only fires if the current post type is non-hierarchical, |
| 845 | * such as posts. |
| 846 | * |
| 847 | * @since 1.5.0 |
| 848 | * |
| 849 | * @param string $column_name The name of the column to display. |
| 850 | * @param int $post_id The current post ID. |
| 851 | */ |
| 852 | do_action( 'manage_posts_custom_column', $column_name, $post->ID ); |
| 853 | } |
| 854 | |
| 855 | /** |
| 856 | * Fires for each custom column of a specific post type in the Posts list table. |
| 857 | * |
| 858 | * The dynamic portion of the hook name, $post->post_type, refers to the post type. |
| 859 | * |
| 860 | * @since 3.1.0 |
| 861 | * |