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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

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Line Code
678           $this->register_globals();
679
680           /**
681            * Fires once the WordPress environment has been set up.
682            *
683            * @since 2.1.0
684            *
685            * @param WP &$this Current WordPress environment instance (passed by reference).
686            */
687           do_action_ref_array( 'wp', array( &$this ) );
688      }
689 }
690
691 /**
692  * Helper class to remove the need to use eval to replace $matches[] in query strings.
693  *
694  * @since 2.9.0
695  */
696 class WP_MatchesMapRegex {