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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 |
|---|---|
| 2626 | * Fires when Heartbeat ticks in logged-in environments. |
| 2627 | * |
| 2628 | * Allows the transport to be easily replaced with long-polling. |
| 2629 | * |
| 2630 | * @since 3.6.0 |
| 2631 | * |
| 2632 | * @param array|object $response The Heartbeat response object or array. |
| 2633 | * @param string $screen_id The screen id. |
| 2634 | */ |
| 2635 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 2636 | |
| 2637 | // Send the current time according to the server |
| 2638 | $response['server_time'] = time(); |
| 2639 | |
| 2640 | wp_send_json( $response ); |
| 2641 | } |
| 2642 | |
| 2643 | /** |
| 2644 | * Ajax handler for getting revision diffs. |