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run code in 300+ PHP versions simultaneously
<?php $arr = []; $a = 1; $b = 2; for($x = 0; $x <= 100_000; $x++) $arr[] = [$a, $b]; echo "Current memory usage: " . (memory_get_usage() / 1024) . " KB\n"; echo "Peak memory usage: " . (memory_get_peak_usage() / 1024) . " KB\n";

preferences:
25.13 ms | 405 KiB | 5 Q