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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 |
|---|---|
| 942 | * |
| 943 | * This hook only fires if the current post type is hierarchical, |
| 944 | * such as pages. |
| 945 | * |
| 946 | * @since 2.5.0 |
| 947 | * |
| 948 | * @param string $column_name The name of the column to display. |
| 949 | * @param int $post_id The current post ID. |
| 950 | */ |
| 951 | do_action( 'manage_pages_custom_column', $column_name, $post->ID ); |
| 952 | } else { |
| 953 | |
| 954 | /** |
| 955 | * Fires in each custom column in the Posts list table. |
| 956 | * |
| 957 | * This hook only fires if the current post type is non-hierarchical, |
| 958 | * such as posts. |
| 959 | * |
| 960 | * @since 1.5.0 |