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@ 2019-10-01T10:01:35Z

<?php

global $array;
    $array = [
        '0' => [
            'id' => 1,
            'parent' => 0,
            'name' => 'root 0'
        ],
        '1' => [
            'id' => 2,
            'parent' => 1,
            'name' => 'root 1'
        ],
        '2' => [
            'id' => 3,
            'parent' => 2, // this should have after parse parent 1
            'name' => 'root 2'
        ],
        '3' => [
            'id' => 4,
            'parent' => 3, // this should have after parse parent 1
            'name' => 'root 3'
        ],
        '4' => [
            'id' => 5,
            'parent' => 3, // this should have after parse parent 1
            'name' => 'root 4'
        ],
        '5' => [
            'id' => 6,
            'parent' => 2, // this should have after parse parent 1
            'name' => 'root 2'
        ]
    ];

    global $new_array;
    $new_array = [];

    foreach( $array as $item )
    {
        if( $item['parent'] == 0 ) {
            $new_array[] = $item; // if parent 0 - clone into new array
            continue;
        }

        //echo $item['name'] . PHP_EOL;
        $temp = check_parent( $item['parent'] ); // get child
        $item['parent'] = $temp['id'];
        $new_array[] = $item;

    }

	echo '<pre>';
    print_r($new_array);

    function check_parent( $parent )
    {
        //echo '- check for parent of ' . $parent . PHP_EOL;
        global $array;
        foreach( $array as $item ) {
            if( $item['id'] == $parent && $item['parent'] == 0 ) {
                //echo '[OK] found root parent id: ' . $item['id'] . PHP_EOL;
                $item['parent'] = $item['id'];
                return $item;
            } else {
                return check_parent( $item['id'] );
            }
        }
    }

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.3.4, 8.3.6 - 8.3.7: <pre>Array ( [0] => Array ( [id] => 1 [parent] => 0 [name] => root 0 ) [1] => Array ( [id] => 2 [parent] => 1 [name] => root 1 ) [2] => Array ( [id] => 3 [parent] => 1 [name] => root 2 ) [3] => Array ( [id] => 4 [parent] => 1 [name] => root 3 ) [4] => Array ( [id] => 5 [parent] => 1 [name] => root 4 ) [5] => Array ( [id] => 6 [parent] => 1 [name] => root 2 ) )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 <pre>Array ( [0] => Array ( [id] => 1 [parent] => 0 [name] => root 0 ) [1] => Array ( [id] => 2 [parent] => 1 [name] => root 1 ) [2] => Array ( [id] => 3 [parent] => 1 [name] => root 2 ) [3] => Array ( [id] => 4 [parent] => 1 [name] => root 3 ) [4] => Array ( [id] => 5 [parent] => 1 [name] => root 4 ) [5] => Array ( [id] => 6 [parent] => 1 [name] => root 2 ) )

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