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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 | 
|---|---|
| 41 |  | 
| 42 |      /** | 
| 43 |       * Filter Heartbeat AJAX response when no data is passed. | 
| 44 |       * | 
| 45 |       * @since 3.6.0 | 
| 46 |       * | 
| 47 |       * @param array|object $response  The Heartbeat response object or array. | 
| 48 |       * @param string       $screen_id The screen id. | 
| 49 |       */ | 
| 50 |      $response = apply_filters( 'heartbeat_nopriv_send', $response, $screen_id ); | 
| 51 |  | 
| 52 |      /** | 
| 53 |       * Fires when Heartbeat ticks in no-privilege environments. | 
| 54 |       * | 
| 55 |       * Allows the transport to be easily replaced with long-polling. | 
| 56 |       * | 
| 57 |       * @since 3.6.0 | 
| 58 |       * | 
| 59 |       * @param array|object $response  The no-priv Heartbeat response. |