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run code in 200+ php & hhvm versions
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<?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"; // refcount(2) func($data); //ob_start(); debug_zval_dump($data[1]['k']); echo explode("\n", ob_get_clean())[0]."\n"; // refcount(3) array_replace_recursive($data[0], $data[1]); echo json_encode($data);
based on 1hoal
Output for 5.5.0 - 5.6.28, 7.0.6 - 7.2.0
[{"k":[0]},{"k":[1]}]
Output for 7.0.0 - 7.0.5
[{"k":[1]},{"k":[1]}]