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run code in 300+ PHP versions simultaneously
<?php $array = [1, 2, 3]; echo implode(',', $array), "\n"; foreach ($array as &$value) {} // by reference echo implode(',', $array), "\n"; foreach ($array as $value) {} // by value (i.e., copy) echo implode(',', $array), "\n";

preferences:
48.42 ms | 402 KiB | 5 Q