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run code in 300+ PHP versions simultaneously
<?php $x = 0.0; $y = -0.0; printf("%.08f == %.08f: %d\n", atan2($x, $y), atan2($y, $y), atan2($x, $y) == atan2($y, $y));

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54.79 ms | 402 KiB | 5 Q