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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 |
|---|---|
| 1335 | * Filters the postbox classes for a specific screen and box ID combo. |
| 1336 | * |
| 1337 | * The dynamic portions of the hook name, `$screen_id` and `$box_id`, refer to |
| 1338 | * the screen ID and meta box ID, respectively. |
| 1339 | * |
| 1340 | * @since 3.2.0 |
| 1341 | * |
| 1342 | * @param string[] $classes An array of postbox classes. |
| 1343 | */ |
| 1344 | $classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes ); |
| 1345 | return implode( ' ', $classes ); |
| 1346 | } |
| 1347 | |
| 1348 | /** |
| 1349 | * Get a sample permalink based off of the post name. |
| 1350 | * |
| 1351 | * @since 2.5.0 |
| 1352 | * |
| 1353 | * @param int|WP_Post $id Post ID or post object. |