hook_menu_alter () is invoked via drupal_alter () as part of menu_router_build () before the menu items (which define all valid Drupal paths) are saved to the {menu_router} table. A Drupal path is the string such as 'node' in example.com/?q=node, or assuming clean URLs, example.com/node. Each path in {menu_router} is unique.
Full Answer
What is hook_menu in Drupal 7?
In Drupal 7 and earlier versions hook_menu has been the Swiss Army knife of hooks. It does a little bit of everything: page paths, menu callbacks, tabs and local tasks, contextual links, access control, arguments and parameters, form callbacks, and on top of all that it even sets up menu items! In my book it’s probably the most-used hook of all.
What is hook_menu used for?
One of the simplest uses of hook_menu is to set up a custom page at a given path. You'd use this for a classic "Hello World" module.
How do I wire up the menu_alter to a class?
To wire up the menu_alter there is also a MODULE.services.yml file with an entry that points to the class that does the work: Many core modules put their RouteSubscriber class in a different location: MODULE/src/EventSubscriber/CLASSNAME.php instead of MODULE/src/Routing/CLASSNAME.php.
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