3v4l.org

run code in 300+ PHP versions simultaneously
<?php $one = [1]; $two = [42]; $arr1 = ['k' => &$one]; $arr2 = ['k' => &$two]; var_dump(current($arr1['k']), current($arr2['k'])); array_replace_recursive($arr1, $arr2); var_dump(current($arr1['k']), current($arr2['k']));
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.13 - 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 - 8.2.19, 8.3.0 - 8.3.7
int(1) int(42) int(1) int(42)
Output for 7.0.0 - 7.0.12
int(1) int(42) int(42) int(42)
preferences:
257.63 ms | 401 KiB | 329 Q