3v4l.org

run code in 300+ PHP versions simultaneously
<?php function wrapper($array, $callback) { foreach ($array as $item) { $callback($item); } } $data = [1, 2, 3, 4, 5]; $i = 1; wrapper($data, function($item) use ($i) { $tmp = $item + $i; echo $tmp . PHP_EOL; $i++; }); echo PHP_EOL; wrapper($data, function($item) use (&$i) { $tmp = $item + $i; echo $tmp . PHP_EOL; $i++; });
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.16, 8.5.0 - 8.5.1
2 3 4 5 6 2 4 6 8 10

preferences:
183.71 ms | 408 KiB | 5 Q