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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 | 
|---|---|
| 3401 |  | 
| 3402 |      /** | 
| 3403 |       * Filters the Heartbeat response sent. | 
| 3404 |       * | 
| 3405 |       * @since 3.6.0 | 
| 3406 |       * | 
| 3407 |       * @param array  $response  The Heartbeat response. | 
| 3408 |       * @param string $screen_id The screen ID. | 
| 3409 |       */ | 
| 3410 |      $response = apply_filters( 'heartbeat_send', $response, $screen_id ); | 
| 3411 |  | 
| 3412 |      /** | 
| 3413 |       * Fires when Heartbeat ticks in logged-in environments. | 
| 3414 |       * | 
| 3415 |       * Allows the transport to be easily replaced with long-polling. | 
| 3416 |       * | 
| 3417 |       * @since 3.6.0 | 
| 3418 |       * | 
| 3419 |       * @param array  $response  The Heartbeat response. |