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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 | 
|---|---|
| 29 | /** | 
| 30 |  * Filter the parent file of an admin menu sub-menu item. | 
| 31 |  * | 
| 32 |  * Allows plugins to move sub-menu items around. | 
| 33 |  * | 
| 34 |  * @since MU | 
| 35 |  * | 
| 36 |  * @param string $parent_file The parent file. | 
| 37 |  */ | 
| 38 | $parent_file = apply_filters( 'parent_file', $parent_file ); | 
| 39 |  | 
| 40 | /** | 
| 41 |  * Filter the file of an admin menu sub-menu item. | 
| 42 |  * | 
| 43 |  * @since 4.4.0 | 
| 44 |  * | 
| 45 |  * @param string $submenu_file The submenu file. | 
| 46 |  * @param string $parent_file  The submenu item's parent file. | 
| 47 |  */ |