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php - WordPress hooks for executing right before any ...

    https://stackoverflow.com/questions/15948162/wordpress-hooks-for-executing-right-before-any-action-or-page-loading
    You mean a hook when all wordpress function will available but before any output including headers sent? Well hook your function on init. That will call when visiting site. If you want this hook only for admin area then it is admin_init.

wp_headers Hook WordPress Developer Resources

    https://developer.wordpress.org/reference/hooks/wp_headers/
    This filter won’t allow you to modify headers if your site serves cached pages via a plugin or third-party caching system. The cached page will be served before your wp_headers are filtered. You may be able to add an HTML meta tag with the http-equiv attribute using wp_head() to work around this for certain headers: http://reference.sitepoint.com/html/meta/http-equiv

The WordPress Hooks Bootcamp: How to Use Actions, Filters ...

    https://kinsta.com/blog/wordpress-hooks/
    Oct 12, 2020 · WordPress includes a built-in action called init that fires after WordPress has finished loading and authenticated the user, but before any headers are sent. Many plugins use this hook as the starting point to instantiate their code as almost all the major WordPress features have finished loading by the time WordPress runs this action.

How do I make my plugin load before the headers are output ...

    https://wordpress.stackexchange.com/questions/174744/how-do-i-make-my-plugin-load-before-the-headers-are-output-so-i-can-redirect-wor
    The correct hook to use is template_redirect which allows you to have the necessary info available to do checks while also early enough to actually redirect. As …

The WordPress Hooks Firing Sequence! • RachieVee: Rachel's ...

    http://rachievee.com/the-wordpress-hooks-firing-sequence/
    Jul 13, 2015 · Fires after WordPress has finished loading, but before any headers are sent. Most of WP is loaded at this stage, and the user is authenticated. WP continues to load on the init hook that follows (e.g. widgets), and many plugins instantiate themselves on it for all sorts of reasons (e.g. they need a user, a taxonomy, etc.).

init Hook WordPress Developer Resources

    https://developer.wordpress.org/reference/hooks/init/
    Description # Description. Most of WP is loaded at this stage, and the user is authenticated. WP continues to load on the ‘init’ hook that follows (e.g. widgets), and many plugins instantiate themselves on it for all sorts of reasons (e.g. they need a user, a taxonomy, etc.).. If you wish to plug an action once WP is loaded, use the ‘wp_loaded’ hook below.

Setting Cookie with init hook causes 'header already sent ...

    https://wordpress.stackexchange.com/questions/324762/setting-cookie-with-init-hook-causes-header-already-sent
    You can solve this issue by checking if the header is already sent: headers_sent() function cc_set_cookie() { if(!headers_sent()) setcookie('COOKIE_NAME', 'COOKIE_VALUE', time()+31556926, '/'); } add_action('init', 'cc_set_cookie');

send_headers — Fires once the requested HTTP headers for ...

    https://www.wp-kama.com/hook/send_headers
    send_headers action-hook . WP 2.1.0. Fires once the requested HTTP headers for caching, content type, etc. have been sent. Usage add_action( 'send_headers', 'action_function_name_9071' ); function action_function_name_9071( $this ){ // action... } $this(WP) Current WordPress environment instance (passed by reference). Changelog
    [CATITEMSBL#1]

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