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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 |
|---|---|
| 2200 | * Fires when Heartbeat ticks in logged-in environments. |
| 2201 | * |
| 2202 | * Allows the transport to be easily replaced with long-polling. |
| 2203 | * |
| 2204 | * @since 3.6.0 |
| 2205 | * |
| 2206 | * @param array|object $response The Heartbeat response object or array. |
| 2207 | * @param string $screen_id The screen id. |
| 2208 | */ |
| 2209 | do_action( 'heartbeat_tick', $response, $screen_id ); |
| 2210 | |
| 2211 | // Send the current time according to the server |
| 2212 | $response['server_time'] = time(); |
| 2213 | |
| 2214 | wp_send_json($response); |
| 2215 | } |
| 2216 | |
| 2217 | function wp_ajax_get_revision_diffs() { |
| 2218 | require ABSPATH . 'wp-admin/includes/revision.php'; |