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<?php $stats = array( array( "totalStatPower" => 4, ), array( "totalStatPower" => 5, "test" => 1, ), array( "totalStatPower" => 10, "test" => 2, ), ); var_dump(array_reduce($stats, function($a, $b) { return array_map(function($v, $k) use ($b) { return $v + isset($b[$k]) ? $b[$k] : 0; }, $a); }, array()));
Output for git.master, git.master_jit, rfc.property-hooks
array(0) { }

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