Online PHP editor | output for 2udcX

@ 2019-05-27T12:53:00Z

<?php
$array = [
    ['App', 'Classes', 'Auth'],
    ['App', 'Classes', 'Auth'],
    ['App', 'Classes', 'Middleware'],
    ['App', 'Classes', 'Phone'],
    ['App', 'Classes', 'Auth'],
    ['App', 'Mail'],
    ['App', 'Mail', 'Sender'],
    ['App', 'Box'],
];
$results = json_decode(json_encode($array));
$tree    = null;
foreach ($results as $result) {
    $thisref                          = &$refs->{$result[0]};
    $tree->{$result[0]}               = &$thisref;
    $thisref                          = &$refs->{$result[1]};
    $tree->{$result[0]}->{$result[1]} = &$thisref;
    if (!empty($result[2])) {
        $thisref                                        = &$refs->{$result[2]};
        $refs->{$result[0]}->{$result[1]}[] = $result[2];//&$thisref;
        $refs->{$result[0]}->{$result[1]} = array_unique($refs->{$result[0]}->{$result[1]});
    }

}
print_r(json_decode(json_encode($tree), true));

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: Fatal error: Uncaught Error: Attempt to modify property "App" on null in /in/2udcX:15 Stack trace: #0 {main} thrown in /in/2udcX on line 15
Process exited with code 255.
Output for 7.4.0 - 7.4.33: Warning: Creating default object from empty value in /in/2udcX on line 15 Warning: Creating default object from empty value in /in/2udcX on line 16 Warning: Creating default object from empty value in /in/2udcX on line 18 Array ( [App] => Array ( [Classes] => Array ( [0] => Auth [1] => Middleware [2] => Phone ) [Mail] => Array ( [0] => Sender ) [Box] => ) )
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Array ( [App] => Array ( [Classes] => Array ( [0] => Auth [1] => Middleware [2] => Phone ) [Mail] => Array ( [0] => Sender ) [Box] => ) )
Output for 7.1.25 - 7.1.33: Array ( [App] => Array ( [Classes] => Array ( [0] => Auth [2] => Middleware [3] => Phone ) [Mail] => Array ( [0] => Sender ) [Box] => ) )

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