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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 |
|---|---|
| 1203 | * Filters the postbox classes for a specific screen and screen ID combo. |
| 1204 | * |
| 1205 | * The dynamic portions of the hook name, `$page` and `$id`, refer to |
| 1206 | * the screen and screen ID, respectively. |
| 1207 | * |
| 1208 | * @since 3.2.0 |
| 1209 | * |
| 1210 | * @param array $classes An array of postbox classes. |
| 1211 | */ |
| 1212 | $classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes ); |
| 1213 | return implode( ' ', $classes ); |
| 1214 | } |
| 1215 | |
| 1216 | /** |
| 1217 | * Get a sample permalink based off of the post name. |
| 1218 | * |
| 1219 | * @since 2.5.0 |
| 1220 | * |
| 1221 | * @param int $id Post ID or post object. |