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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 | 
|---|---|
| 3496 |      do_action( 'deprecated_argument_run', $function, $message, $version ); | 
| 3497 |  | 
| 3498 |      /** | 
| 3499 |       * Filter whether to trigger an error for deprecated arguments. | 
| 3500 |       * | 
| 3501 |       * @since 3.0.0 | 
| 3502 |       * | 
| 3503 |       * @param bool $trigger Whether to trigger the error for deprecated arguments. Default true. | 
| 3504 |       */ | 
| 3505 |      if ( WP_DEBUG && apply_filters( 'deprecated_argument_trigger_error', true ) ) { | 
| 3506 |           if ( function_exists( '__' ) ) { | 
| 3507 |                if ( ! is_null( $message ) ) | 
| 3508 |                     trigger_error( sprintf( __('%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s'), $function, $version, $message ) ); | 
| 3509 |                else | 
| 3510 |                     trigger_error( sprintf( __('%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) ); | 
| 3511 |           } else { | 
| 3512 |                if ( ! is_null( $message ) ) | 
| 3513 |                     trigger_error( sprintf( '%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s', $function, $version, $message ) ); | 
| 3514 |                else |