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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 |
|---|---|
| 1374 | * Filters the postbox classes for a specific screen and box ID combo. |
| 1375 | * |
| 1376 | * The dynamic portions of the hook name, `$screen_id` and `$box_id`, refer to |
| 1377 | * the screen ID and meta box ID, respectively. |
| 1378 | * |
| 1379 | * @since 3.2.0 |
| 1380 | * |
| 1381 | * @param string[] $classes An array of postbox classes. |
| 1382 | */ |
| 1383 | $classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes ); |
| 1384 | |
| 1385 | return implode( ' ', $classes ); |
| 1386 | } |
| 1387 | |
| 1388 | /** |
| 1389 | * Returns a sample permalink based on the post name. |
| 1390 | * |
| 1391 | * @since 2.5.0 |
| 1392 | * |