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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 |
|---|---|
| 3427 | * Fires when Heartbeat ticks in logged-in environments. |
| 3428 | * |
| 3429 | * Allows the transport to be easily replaced with long-polling. |
| 3430 | * |
| 3431 | * @since 3.6.0 |
| 3432 | * |
| 3433 | * @param array $response The Heartbeat response. |
| 3434 | * @param string $screen_id The screen ID. |
| 3435 | */ |
| 3436 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 3437 | |
| 3438 | // Send the current time according to the server. |
| 3439 | $response['server_time'] = time(); |
| 3440 | |
| 3441 | wp_send_json( $response ); |
| 3442 | } |
| 3443 | |
| 3444 | /** |
| 3445 | * Ajax handler for getting revision diffs. |