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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 |
|---|---|
| 1304 | * Filters the postbox classes for a specific screen and screen ID combo. |
| 1305 | * |
| 1306 | * The dynamic portions of the hook name, `$page` and `$id`, refer to |
| 1307 | * the screen and screen ID, respectively. |
| 1308 | * |
| 1309 | * @since 3.2.0 |
| 1310 | * |
| 1311 | * @param string[] $classes An array of postbox classes. |
| 1312 | */ |
| 1313 | $classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes ); |
| 1314 | return implode( ' ', $classes ); |
| 1315 | } |
| 1316 | |
| 1317 | /** |
| 1318 | * Get a sample permalink based off of the post name. |
| 1319 | * |
| 1320 | * @since 2.5.0 |
| 1321 | * |
| 1322 | * @param int $id Post ID or post object. |