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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 |
|---|---|
| 1096 | * Filter the postbox classes for a specific screen and screen ID combo. |
| 1097 | * |
| 1098 | * The dynamic portions of the hook name, $page, and $id, refer to |
| 1099 | * the screen, and screen ID, respectively. |
| 1100 | * |
| 1101 | * @since 3.2.0 |
| 1102 | * |
| 1103 | * @param array $classes An array of postbox classes. |
| 1104 | */ |
| 1105 | $classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes ); |
| 1106 | return implode( ' ', $classes ); |
| 1107 | } |
| 1108 | |
| 1109 | /** |
| 1110 | * {@internal Missing Short Description}} |
| 1111 | * |
| 1112 | * @since 2.5.0 |
| 1113 | * |
| 1114 | * @param int|object $id Post ID or post object. |