Online PHP editor | output for 6eSUQ

@ 2015-12-30T00:30:26Z

<?php

function get_refcount(&$v) {
    ob_start();
    debug_zval_dump($v);
    $m = null;
    preg_match('@refcount\(\d+\)@', ob_get_clean(), $m);
    return $m[1];
}

function func(&$data) {
    foreach ($data as $key => $value) {
        if (is_array($value)) {
            func($data[$key]);
        }
    }
}

$data = [
    ['k' => [0]],
    ['k' => [1]],
];

echo get_refcount($data[1]['k']); //refcount(2)
func($data);
echo get_refcount($data[1]['k']); //refcount(3)
array_replace_recursive($data[0], $data[1]);
echo json_encode($data);

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Warning: Undefined array key 1 in /in/6eSUQ on line 8 Warning: Undefined array key 1 in /in/6eSUQ on line 8 [{"k":[0]},{"k":[1]}]
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.6 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined offset: 1 in /in/6eSUQ on line 8 Notice: Undefined offset: 1 in /in/6eSUQ on line 8 [{"k":[0]},{"k":[1]}]
Output for 7.3.32 - 7.3.33: [{"k":[0]},{"k":[1]}]
Output for 7.0.0 - 7.0.5: Notice: Undefined offset: 1 in /in/6eSUQ on line 8 Notice: Undefined offset: 1 in /in/6eSUQ on line 8 [{"k":[1]},{"k":[1]}]

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