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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 |
---|---|
1198 | * Filters the postbox classes for a specific screen and screen ID combo. |
1199 | * |
1200 | * The dynamic portions of the hook name, `$page` and `$id`, refer to |
1201 | * the screen and screen ID, respectively. |
1202 | * |
1203 | * @since 3.2.0 |
1204 | * |
1205 | * @param array $classes An array of postbox classes. |
1206 | */ |
1207 | $classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes ); |
1208 | return implode( ' ', $classes ); |
1209 | } |
1210 |
|
1211 | /** |
1212 | * Get a sample permalink based off of the post name. |
1213 | * |
1214 | * @since 2.5.0 |
1215 | * |
1216 | * @param int $id Post ID or post object. |