Online PHP editor | refs for ojFEX

<?php $a = range(3, 9); foreach ($a as $b) { switch($b) { case 3: $b = 7; case 7: $b = 3; default: // do nothing } } echo implode('-', $a) . PHP_EOL; $a = range(3, 9); foreach ($a as $key => $b) { switch($b) { case 3: $a[$key] = 7; case 7: $a[$key] = 3; default: // do nothing } } echo implode('-', $a) . PHP_EOL; $a = range(3, 9); foreach ($a as &$b) { switch($b) { case 3: $b = 7; case 7: $b = 3; default: // do nothing } } echo implode('-', $a) . PHP_EOL;