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run code in 300+ PHP versions simultaneously
<?php $data=array(); for($c=0; $c<1000; $c++) $data[$c]=array(1, 2, 3); $filter=array(1, 2, 3); for($kc=0; $kc<3; $kc++) { $cm=memory_get_usage(true); $pm=memory_get_peak_usage(true); echo "loop $kc: current_memory: $cm, peak_memory: $pm...\n"; flush(); foreach($data as $entry) foreach($filter as $pattern) continue 2; } ?>

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32.52 ms | 402 KiB | 5 Q