via [PHP] 論理演算子「and, or」と「&&, ||」の違い | Screw-Axis 1. $x = (true and false); → false 2. $x = true and false; → true 3. $x = false and true; → 4. $x = (true && false); → false 5. $x = true && false; → false 6. $x = false && true…