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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 |
|---|---|
| 1227 | * Filters the postbox classes for a specific screen and screen ID combo. |
| 1228 | * |
| 1229 | * The dynamic portions of the hook name, `$page` and `$id`, refer to |
| 1230 | * the screen and screen ID, respectively. |
| 1231 | * |
| 1232 | * @since 3.2.0 |
| 1233 | * |
| 1234 | * @param array $classes An array of postbox classes. |
| 1235 | */ |
| 1236 | $classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes ); |
| 1237 | return implode( ' ', $classes ); |
| 1238 | } |
| 1239 | |
| 1240 | /** |
| 1241 | * Get a sample permalink based off of the post name. |
| 1242 | * |
| 1243 | * @since 2.5.0 |
| 1244 | * |
| 1245 | * @param int $id Post ID or post object. |