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<?php $array = [ [ "id" => "food,Travel", "names" => "chimpanzee" ], [ "id" => "food", "name" => "meeting" ], [ "id" => "Z1", "name" => "dynasty" ], [ "id" => "X", "name" => "chocolate" ], [ "id" => "Travel", "name" => "bananas" ], [ "id" => "Travel", "name" => "fantasy" ], [ "id" => "Travel", "name" => "football" ] ]; $newarray= []; foreach($array as $key => $value) { if(is_array(explode(",", $value["id"]))) { foreach(explode(",", $value["id"]) as $category) { $newarray[$category][$key] = $value; $newarray[$category][$key]["id"] = $category; } } else { $newarray[$value["id"]][$key] = $value; } } var_dump($newarray);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { ["food"]=> array(2) { [0]=> array(2) { ["id"]=> string(4) "food" ["names"]=> string(10) "chimpanzee" } [1]=> array(2) { ["id"]=> string(4) "food" ["name"]=> string(7) "meeting" } } ["Travel"]=> array(4) { [0]=> array(2) { ["id"]=> string(6) "Travel" ["names"]=> string(10) "chimpanzee" } [4]=> array(2) { ["id"]=> string(6) "Travel" ["name"]=> string(7) "bananas" } [5]=> array(2) { ["id"]=> string(6) "Travel" ["name"]=> string(7) "fantasy" } [6]=> array(2) { ["id"]=> string(6) "Travel" ["name"]=> string(8) "football" } } ["Z1"]=> array(1) { [2]=> array(2) { ["id"]=> string(2) "Z1" ["name"]=> string(7) "dynasty" } } ["X"]=> array(1) { [3]=> array(2) { ["id"]=> string(1) "X" ["name"]=> string(9) "chocolate" } } }

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