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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 |
|---|---|
| 1354 | * Filters the postbox classes for a specific screen and box ID combo. |
| 1355 | * |
| 1356 | * The dynamic portions of the hook name, `$screen_id` and `$box_id`, refer to |
| 1357 | * the screen ID and meta box ID, respectively. |
| 1358 | * |
| 1359 | * @since 3.2.0 |
| 1360 | * |
| 1361 | * @param string[] $classes An array of postbox classes. |
| 1362 | */ |
| 1363 | $classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes ); |
| 1364 | return implode( ' ', $classes ); |
| 1365 | } |
| 1366 | |
| 1367 | /** |
| 1368 | * Returns a sample permalink based on the post name. |
| 1369 | * |
| 1370 | * @since 2.5.0 |
| 1371 | * |
| 1372 | * @param int|WP_Post $id Post ID or post object. |