3v4l.org

run code in 300+ PHP versions simultaneously
<?php $minimum = 0.25; $step = 0.1; $tests = [0.75, 0.76, 0.80, 0.85]; foreach ($tests as $original) { $new = $original + ($step - fmod($original - $minimum, $step)); echo $original, ' => ', $new, PHP_EOL; }

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32.87 ms | 404 KiB | 5 Q