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<?php $arr = [ ["year" => 1921, "name" => "bob"], ["year" => 1944, "name" => "steve"], ["year" => 1944, "name" => "doug"], ["year" => 1921, "name" => "jim"], ]; foreach ($arr as $item) { $result[$item['year']]['year'] = $item['year']; $result[$item['year']]['names'][] = ['name' => $item['name']]; } echo json_encode(['data' => array_values($result)], JSON_PRETTY_PRINT);
Output for git.master, git.master_jit, rfc.property-hooks
{ "data": [ { "year": 1921, "names": [ { "name": "bob" }, { "name": "jim" } ] }, { "year": 1944, "names": [ { "name": "steve" }, { "name": "doug" } ] } ] }

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