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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 |
|---|---|
| 2727 | * Fires when Heartbeat ticks in logged-in environments. |
| 2728 | * |
| 2729 | * Allows the transport to be easily replaced with long-polling. |
| 2730 | * |
| 2731 | * @since 3.6.0 |
| 2732 | * |
| 2733 | * @param array|object $response The Heartbeat response object or array. |
| 2734 | * @param string $screen_id The screen id. |
| 2735 | */ |
| 2736 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 2737 | |
| 2738 | // Send the current time according to the server |
| 2739 | $response['server_time'] = time(); |
| 2740 | |
| 2741 | wp_send_json( $response ); |
| 2742 | } |
| 2743 | |
| 2744 | /** |
| 2745 | * Ajax handler for getting revision diffs. |