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<?php $str = <<<EOL [ { "tax": "10", "concept": "TUC", "val": "10" }, { "tax": "10", "concept": "TUC", "val": "86" }, { "tax": "15", "concept": "TUC", "val": "8" }, { "tax": "11", "concept": "IPS", "val": "6" }, { "tax": "11", "concept": "IPS", "val": "45" } ] EOL; $array = json_decode($str); $result = array_reduce($array, function($carry, $item) { if(!isset($carry[$item->tax])) { $carry[$item->tax] = $item; } else { $carry[$item->tax]->val += $item->val; } return $carry; }); $result = array_values($result); print_r(json_encode($result));
Output for git.master, git.master_jit, rfc.property-hooks
[{"tax":"10","concept":"TUC","val":96},{"tax":"15","concept":"TUC","val":"8"},{"tax":"11","concept":"IPS","val":51}]

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