[wp-trac] [WordPress Trac] #38777: Add method to merge one WP_Error into another

[WordPress Trac]

#38777: Add method to merge one WP_Error into another
--------------------------+-----------------------------
 Reporter:  rmccue        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:  rest-api      |
--------------------------+-----------------------------
 `WP_Error` can store multiple error messages and codes, but this requires
 building the error object manually. If you have two existing error
 instances and want to merge them into a single one, you have to do this
 manually:

 {{{
 foreach ( $other_errors as $code => $messages ) {
         foreach ( $messages as $message ) {
                 $error->add( $code, $message );
         }
         if ( $error_data = $error->get_error_data( $code ) ) {
                 $error->add_data( $error_data, $code );
         }
 }
 }}}

 While this multi-error feature isn't widely used, it's very helpful in the
 REST API, where multi-errors are natively supported via an
 `additional_errors` key in the error response.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38777>
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