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run code in 150+ php & hhvm versions
Bugs & Features
<?php $ori=json_decode(<<<JSON [{"category":"ABC","orderID":"12345","Name":"Pen","Name2":"Black"}, {"category":"ABC","orderID":"34545","Name":"Pencil","Name2":"White"}, {"category":"ABC","orderID":"34545","Name":"Pen","Name2":"Black"}, {"category":"DEF","orderID":"12345","Name":"Pencil","Name2":"Black"}, {"category":"DEF","orderID":"12345","Name":"Pen","Name2":"White"}] JSON ,true); $result=array(); while($row=array_shift($ori))//Pretend that we're fetching record from DB { $result[$row["category"]][$row["orderID"]][]=array("Name"=>$row["Name"],"Name2"=>$row["Name2"]); } print_r($result);//This should be better //But if you insist, this can help: array_walk($result,function(&$v,$k){ $x=array("category"=>$k,"children"=>array()); array_walk($v,function($arr,$oid)use(&$x){ $x["children"][]=array("orderID"=>$oid,"children"=>$arr); }); $v=$x; }); print_r(array_values($result));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [ABC] => Array ( [12345] => Array ( [0] => Array ( [Name] => Pen [Name2] => Black ) ) [34545] => Array ( [0] => Array ( [Name] => Pencil [Name2] => White ) [1] => Array ( [Name] => Pen [Name2] => Black ) ) ) [DEF] => Array ( [12345] => Array ( [0] => Array ( [Name] => Pencil [Name2] => Black ) [1] => Array ( [Name] => Pen [Name2] => White ) ) ) ) Array ( [0] => Array ( [category] => ABC [children] => Array ( [0] => Array ( [orderID] => 12345 [children] => Array ( [0] => Array ( [Name] => Pen [Name2] => Black ) ) ) [1] => Array ( [orderID] => 34545 [children] => Array ( [0] => Array ( [Name] => Pencil [Name2] => White ) [1] => Array ( [Name] => Pen [Name2] => Black ) ) ) ) ) [1] => Array ( [category] => DEF [children] => Array ( [0] => Array ( [orderID] => 12345 [children] => Array ( [0] => Array ( [Name] => Pencil [Name2] => Black ) [1] => Array ( [Name] => Pen [Name2] => White ) ) ) ) ) )
Output for 4.4.3 - 4.4.9, 5.1.0 - 5.1.1, 5.1.3 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/abWvg on line 17
Process exited with code 255.
Output for 4.4.2, 5.1.2
Parse error: syntax error, unexpected T_FUNCTION in /in/abWvg on line 18
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/abWvg on line 17
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/abWvg on line 17
Process exited with code 255.