3v4l.org

run code in 300+ PHP versions simultaneously
<?php function func(&$data) { foreach ($data as $key => $value) { if (is_array($value)) { func($data[$key]); } } } $data = [ ['k' => [0]], ['k' => [1]], ]; ob_start(); debug_zval_dump($data[1]['k']); echo explode("\n", ob_get_clean())[0]."\n"; func($data); ob_start(); debug_zval_dump($data[1]['k']); echo explode("\n", ob_get_clean())[0]."\n"; array_replace_recursive($data[0], $data[1]); echo json_encode($data);
Output for 7.0.6 - 7.0.20, 7.1.0 - 7.1.25, 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(1) refcount(2){ array(1) refcount(3){ [{"k":[0]},{"k":[1]}]
Output for 7.0.0 - 7.0.5
array(1) refcount(2){ array(1) refcount(3){ [{"k":[1]},{"k":[1]}]
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
array(1) refcount(2){ array(1) refcount(2){ [{"k":[0]},{"k":[1]}]
preferences:
178.93 ms | 402 KiB | 237 Q