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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 | 
|---|---|
| 2689 |       * Filters whether to treat the upload bits as an error. | 
| 2690 |       * | 
| 2691 |       * Returning a non-array from the filter will effectively short-circuit preparing the upload bits | 
| 2692 |       * and return that value instead. An error message should be returned as a string. | 
| 2693 |       * | 
| 2694 |       * @since 3.0.0 | 
| 2695 |       * | 
| 2696 |       * @param array|string $upload_bits_error An array of upload bits data, or error message to return. | 
| 2697 |       */ | 
| 2698 |      $upload_bits_error = apply_filters( | 
| 2699 |           'wp_upload_bits', | 
| 2700 |           array( | 
| 2701 |                'name' => $name, | 
| 2702 |                'bits' => $bits, | 
| 2703 |                'time' => $time, | 
| 2704 |           ) | 
| 2705 |      ); | 
| 2706 |      if ( ! is_array( $upload_bits_error ) ) { | 
| 2707 |           $upload['error'] = $upload_bits_error; |