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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 |
---|---|
2832 | * Fires when Heartbeat ticks in logged-in environments. |
2833 | * |
2834 | * Allows the transport to be easily replaced with long-polling. |
2835 | * |
2836 | * @since 3.6.0 |
2837 | * |
2838 | * @param array $response The Heartbeat response. |
2839 | * @param string $screen_id The screen id. |
2840 | */ |
2841 | do_action( 'heartbeat_tick', $response, $screen_id ); |
2842 |
|
2843 | // Send the current time according to the server |
2844 | $response['server_time'] = time(); |
2845 |
|
2846 | wp_send_json( $response ); |
2847 | } |
2848 |
|
2849 | /** |
2850 | * Ajax handler for getting revision diffs. |