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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 |
|---|---|
| 57 | * Fires when Heartbeat ticks in no-privilege environments. |
| 58 | * |
| 59 | * Allows the transport to be easily replaced with long-polling. |
| 60 | * |
| 61 | * @since 3.6.0 |
| 62 | * |
| 63 | * @param array|object $response The no-priv Heartbeat response. |
| 64 | * @param string $screen_id The screen id. |
| 65 | */ |
| 66 | do_action( 'heartbeat_nopriv_tick', $response, $screen_id ); |
| 67 | |
| 68 | // Send the current time according to the server. |
| 69 | $response['server_time'] = time(); |
| 70 | |
| 71 | wp_send_json($response); |
| 72 | } |
| 73 | |
| 74 | // |
| 75 | // GET-based Ajax handlers. |