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do_action_ref_array( ‘wp’, WP $wp )

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Fires once the WordPress environment has been set up.

Parameters

$wpWP
Current WordPress environment instance (passed by reference).

More Information

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. It is run in the main() WP method in which the $query_args are passed to parse_request(), as well as when send_headers() , query_posts(), handle_404(), and register_globals() are setup.

Source

do_action_ref_array( 'wp', array( &$this ) );

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Used byDescription
WP::main()wp-includes/class-wp.php

Sets up all of the variables required by the WordPress environment.

Changelog

VersionDescription
2.1.0Introduced.

User Contributed Notes

  1. Skip to note 2 content
    Collins Mbaka
    You must log in to vote on the helpfulness of this noteVote results for this note: 1You must log in to vote on the helpfulness of this note

    This action will allow us to set a cookie in the headers but still have access to the WP class object. This example will show you how to set a cookie if you are on a specific page ID.

    function wpdocs_set_cookie() {
  // using is_page conditional for specific page ID
  if ( is_page( 126 ) ) {
    setcookie( "wpdocs-my-custom-cookie", "true", time() + ( YEAR_IN_SECONDS * 5 ), COOKIEPATH, COOKIE_DOMAIN, false ); 
  }
}

add_action( 'wp', 'wpdocs_set_cookie' );

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