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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 404 |  * This hook is fired once WP, all plugins, and the theme are fully loaded and instantiated. | 
| 405 |  * | 
| 406 |  * AJAX requests should use wp-admin/admin-ajax.php. admin-ajax.php can handle requests for | 
| 407 |  * users not logged in. | 
| 408 |  * | 
| 409 |  * @link https://codex.wordpress.org/AJAX_in_Plugins | 
| 410 |  * | 
| 411 |  * @since 3.0.0 | 
| 412 |  */ | 
| 413 | do_action( 'wp_loaded' ); | 
| 414 |  |