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<?php // 数字の文字列に対する総和を計算する function calculateSum(string $param) : string { $su = (int)$param; $res = 0; for ($i = 1; $i <= $su; $i++) { $res += $i; } if ($su <= 0) { return "ERROR"; } return (string)$res; } var_dump(calculateSum('10'));
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(2) "55"
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