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<?php function addOrIncr(&$arr, $key, $value) { $arr[$key] = ($arr[$key] ?? 0) + $value; } $arr = ['foo' => 1]; $value = 10; $key = 'foo'; $arr[$key] = ($arr[$key] ?? 0) + $value; $key = 'bar'; $arr[$key] = ($arr[$key] ?? 0) + $value; var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["foo"]=> int(11) ["bar"]=> int(10) }

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