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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 |
|---|---|
| 3170 | * Fires when Heartbeat ticks in logged-in environments. |
| 3171 | * |
| 3172 | * Allows the transport to be easily replaced with long-polling. |
| 3173 | * |
| 3174 | * @since 3.6.0 |
| 3175 | * |
| 3176 | * @param array $response The Heartbeat response. |
| 3177 | * @param string $screen_id The screen id. |
| 3178 | */ |
| 3179 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 3180 | |
| 3181 | // Send the current time according to the server |
| 3182 | $response['server_time'] = time(); |
| 3183 | |
| 3184 | wp_send_json( $response ); |
| 3185 | } |
| 3186 | |
| 3187 | /** |
| 3188 | * Ajax handler for getting revision diffs. |