3v4l.org

run code in 300+ PHP versions simultaneously
<?php function test($input) { var_dump(($input >= 0.6 && $input <= 1) ? range ('A', 'D')[(0.999 - $input)*10] : 'F'); } test(0.7); test(1); test(0.6); test(0.5); test(2);

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37.5 ms | 402 KiB | 5 Q