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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 |
|---|---|
| 591 | * This hook is fired once WP, all plugins, and the theme are fully loaded and instantiated. |
| 592 | * |
| 593 | * Ajax requests should use wp-admin/admin-ajax.php. admin-ajax.php can handle requests for |
| 594 | * users not logged in. |
| 595 | * |
| 596 | * @link https://codex.wordpress.org/AJAX_in_Plugins |
| 597 | * |
| 598 | * @since 3.0.0 |
| 599 | */ |
| 600 | do_action( 'wp_loaded' ); |
| 601 | |