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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 |
|---|---|
| 34 | /** |
| 35 | * Filters the parent file of an admin menu sub-menu item. |
| 36 | * |
| 37 | * Allows plugins to move sub-menu items around. |
| 38 | * |
| 39 | * @since MU (3.0.0) |
| 40 | * |
| 41 | * @param string $parent_file The parent file. |
| 42 | */ |
| 43 | $parent_file = apply_filters( 'parent_file', $parent_file ); |
| 44 | |
| 45 | /** |
| 46 | * Filters the file of an admin menu sub-menu item. |
| 47 | * |
| 48 | * @since 4.4.0 |
| 49 | * |
| 50 | * @param string $submenu_file The submenu file. |
| 51 | * @param string $parent_file The submenu item's parent file. |
| 52 | */ |