Online PHP editor | refs for GKiZ1

<?php $array = Array( "0" => Array("CategoryID" => 3,"CategoryName" => "Test Category","Parent" => 0,"Thumb" => 0,"sort" => 8,"ArticleID" => 2,"ArticleCatgories" => "9,4,3","ArticleTitle" => "vxcvxcvx","ArticleBody" => "xcvxcvxcvxcv","InGroup" => 0,"GroupID" => 0,"Published" => 1,"PublishTime" => null,"TermID" => 11,"TermSlug" => "xcvxcvxcv","RelatedID" => 2,"TermType" => "article"), "1" => Array("CategoryID" => 4,"CategoryName" => "Test Image","Parent" => 0,"Thumb" => 0,"sort" => 4,"ArticleID" => 3,"ArticleCatgories" => "9,4,3","ArticleTitle" => "vxcvxcvx","ArticleBody" => "xcvxcvxcvxcv","InGroup" => 0,"GroupID" => 0,"Published" => 1,"PublishTime" => null,"TermID" => 11,"TermSlug" => "xcvxcvxcv","RelatedID" => 2,"TermType" => "article"), "2" => Array("CategoryID" => 9,"CategoryName" => "Test Images","Parent" => 0,"Thumb" => 7,"sort" => 2,"ArticleID" => 2,"ArticleCatgories" => "9,4,3","ArticleTitle" => "vxcvxcvx","ArticleBody" => "xcvxcvxcvxcv","InGroup" => 0,"GroupID" => 0,"Published" => 1,"PublishTime" => null,"TermID" => 11,"TermSlug" => "xcvxcvxcv","RelatedID" => 2,"TermType" => "article"), "3" => Array("CategoryID" => 4,"CategoryName" => "Test A","Parent" => 0,"Thumb" => 0,"sort" => 4,"ArticleID" => 3,"ArticleCatgories" => "9,4,3","ArticleTitle" => "vxcvxcvx","ArticleBody" => "xcvxcvxcvxcv","InGroup" => 0,"GroupID" => 0,"Published" => 1,"PublishTime" => null,"TermID" => 11,"TermSlug" => "xcvxcvxcv","RelatedID" => 2,"TermType" => "article"), "4" => Array("CategoryID" => 9,"CategoryName" => "Test B","Parent" => 0,"Thumb" => 7,"sort" => 2,"ArticleID" => 2,"ArticleCatgories" => "9,4,3","ArticleTitle" => "vxcvxcvx","ArticleBody" => "xcvxcvxcvxcv","InGroup" => 0,"GroupID" => 0,"Published" => 1,"PublishTime" => null,"TermID" => 11,"TermSlug" => "xcvxcvxcv","RelatedID" => 2,"TermType" => "article") ); $array = array_reduce( $array, function ($a, $b) { if (!isset($a[$b['ArticleID']])) { $a[$b['ArticleID']] = $b ; $a[$b['ArticleID']]['CategoryName'] = array($b['CategoryName']); } else { $a[$b['ArticleID']]['CategoryName'][] = $b['CategoryName']; } return $a; } ); var_dump($array);