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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 |
|---|---|
| 821 | $this->send_headers(); |
| 822 | |
| 823 | /** |
| 824 | * Fires once the WordPress environment has been set up. |
| 825 | * |
| 826 | * @since 2.1.0 |
| 827 | * |
| 828 | * @param WP $wp Current WordPress environment instance (passed by reference). |
| 829 | */ |
| 830 | do_action_ref_array( 'wp', array( &$this ) ); |
| 831 | } |
| 832 | } |
| 833 | |