3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(1,2,3,4); foreach ($array as $key => $value) { $value = &$value . ' R$'; } var_dump($array);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) }
preferences:
255.49 ms | 404 KiB | 291 Q