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run code in 300+ PHP versions simultaneously
<?php // PHP pre-7.1.0 modulo bias demo mt_srand(1234567890); $total = 100000; $max = 0x66666666; $halves[0] = $halves[1] = 0; for ($i = 0; $i < $total; $i++) { $halves[(mt_rand(0, $max - 1) >> 1) & 1]++; } printf("%.1f%% vs. %.1f%%\n", 100. * $halves[0] / $total, 100. * $halves[1] / $total); ?>
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.27, 8.0.0 - 8.0.15, 8.1.0 - 8.1.2
49.9% vs. 50.1%
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
40.0% vs. 60.0%
preferences:
183.26 ms | 401 KiB | 228 Q