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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 |
|---|---|
| 2576 | * Fires when Heartbeat ticks in logged-in environments. |
| 2577 | * |
| 2578 | * Allows the transport to be easily replaced with long-polling. |
| 2579 | * |
| 2580 | * @since 3.6.0 |
| 2581 | * |
| 2582 | * @param array|object $response The Heartbeat response object or array. |
| 2583 | * @param string $screen_id The screen id. |
| 2584 | */ |
| 2585 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 2586 | |
| 2587 | // Send the current time according to the server |
| 2588 | $response['server_time'] = time(); |
| 2589 | |
| 2590 | wp_send_json($response); |
| 2591 | } |
| 2592 | |
| 2593 | /** |
| 2594 | * Ajax handler for getting revision diffs. |