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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 |
|---|---|
| 1322 | * |
| 1323 | * This hook only fires if the current post type is hierarchical, |
| 1324 | * such as pages. |
| 1325 | * |
| 1326 | * @since 2.5.0 |
| 1327 | * |
| 1328 | * @param string $column_name The name of the column to display. |
| 1329 | * @param int $post_id The current post ID. |
| 1330 | */ |
| 1331 | do_action( 'manage_pages_custom_column', $column_name, $post->ID ); |
| 1332 | } else { |
| 1333 | |
| 1334 | /** |
| 1335 | * Fires in each custom column in the Posts list table. |
| 1336 | * |
| 1337 | * This hook only fires if the current post type is non-hierarchical, |
| 1338 | * such as posts. |
| 1339 | * |
| 1340 | * @since 1.5.0 |