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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 | 
|---|---|
| 5580 |      do_action( 'deprecated_argument_run', $function, $message, $version ); | 
| 5581 |  | 
| 5582 |      /** | 
| 5583 |       * Filters whether to trigger an error for deprecated arguments. | 
| 5584 |       * | 
| 5585 |       * @since 3.0.0 | 
| 5586 |       * | 
| 5587 |       * @param bool $trigger Whether to trigger the error for deprecated arguments. Default true. | 
| 5588 |       */ | 
| 5589 |      if ( WP_DEBUG && apply_filters( 'deprecated_argument_trigger_error', true ) ) { | 
| 5590 |           if ( function_exists( '__' ) ) { | 
| 5591 |                if ( $message ) { | 
| 5592 |                     trigger_error( | 
| 5593 |                          sprintf( | 
| 5594 |                               /* translators: 1: PHP function name, 2: Version number, 3: Optional message regarding the change. */ | 
| 5595 |                               __( '%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s' ), | 
| 5596 |                               $function, | 
| 5597 |                               $version, | 
| 5598 |                               $message |