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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 |
---|---|
3517 | * Fires when Heartbeat ticks in logged-in environments. |
3518 | * |
3519 | * Allows the transport to be easily replaced with long-polling. |
3520 | * |
3521 | * @since 3.6.0 |
3522 | * |
3523 | * @param array $response The Heartbeat response. |
3524 | * @param string $screen_id The screen ID. |
3525 | */ |
3526 | do_action( 'heartbeat_tick', $response, $screen_id ); |
3527 |
|
3528 | // Send the current time according to the server. |
3529 | $response['server_time'] = time(); |
3530 |
|
3531 | wp_send_json( $response ); |
3532 | } |
3533 |
|
3534 | /** |
3535 | * Handles getting revision diffs via AJAX. |