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Plugin API/Action Reference/wp

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This action hook runs immediately after the global WP class object is set up. The $wp object is passed to the hooked function as a reference (no return is necessary).

This hook is one effective place to perform any high-level filtering or validation, following queries, but before WordPress does any routing, processing, or handling.

Source File

The 'wp' hook is found in /wp-includes/class-wp.php, within the main() method of the WP() class.