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run code in 300+ PHP versions simultaneously
<?php $arr = array_fill(0, 100000, true); printf("%.2f mb\n", memory_get_peak_usage() / 1024 / 1024); foreach ($arr as $value) { break; } printf("%.2f mb\n", memory_get_peak_usage() / 1024 / 1024); foreach (array_keys($arr) as $value) { break; } printf("%.2f mb\n", memory_get_peak_usage() / 1024 / 1024);

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121.68 ms | 402 KiB | 5 Q