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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 |
|---|---|
| 3160 | * Fires when Heartbeat ticks in logged-in environments. |
| 3161 | * |
| 3162 | * Allows the transport to be easily replaced with long-polling. |
| 3163 | * |
| 3164 | * @since 3.6.0 |
| 3165 | * |
| 3166 | * @param array $response The Heartbeat response. |
| 3167 | * @param string $screen_id The screen id. |
| 3168 | */ |
| 3169 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 3170 | |
| 3171 | // Send the current time according to the server |
| 3172 | $response['server_time'] = time(); |
| 3173 | |
| 3174 | wp_send_json( $response ); |
| 3175 | } |
| 3176 | |
| 3177 | /** |
| 3178 | * Ajax handler for getting revision diffs. |