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run code in 300+ PHP versions simultaneously
<?php $a = ['foo','bar','baz']; foreach ($a as $i) { echo $i . " - " . current($a) . "\n"; } echo "---\n"; foreach ($a as &$i) { echo $i . " - " . current($a) . "\n"; }

preferences:
42.66 ms | 402 KiB | 5 Q