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@ 2018-10-31T15:13:23Z

<?php
$arr = array(
    0 => array(
        "text" => "eventyrer",
        "children"=> array(
                4 => array(
                        "text" => "news",
                        "children"=> array(
                                1=> array("text"=>"a")
                            )
                    ),

                5 => array(
                        "text" => "nyheter",
                        "children"=> array(
                                1=> array("text"=>"b")
                            )
                    )
            ) 
    ),

    1 => array(
        "text" => "eventyrer2017",
        "children"=> array(
                6 => array(
                        "text" => "news",
                        "children"=> array(
                                1=> array("text"=>"c")
                            )
                    ),

                8 => array(
                        "text" => "nyheter",
                        "children"=> array(
                                1=> array(
                                    "text"=>"d",
                                    "children"=> array(
                                        1=> array("text"=>"e")
                                    )
                                )
                            )
                    )
            ) 
    )

);

$new_array = [];

foreach($arr as &$value) {
    //loop through first set

    foreach($value['children'] as $child) {

        //loop through children, create a string that contains the first set of values "text", and the childrens "text"
        $string = "{$value['text']}/{$child['text']}";

        foreach($child['children'] as $child2) {

            //loop through each child of child1 and add a new string to the new_array containing `$string` + the child2.
            $new_array[] = $string .= "/{$child2['text']}"; 

        }
    }

}
var_export($new_array);

Output for 5.6.38, 7.1.0 - 7.1.33, 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 - 8.3.4, 8.3.6: array ( 0 => 'eventyrer/news/a', 1 => 'eventyrer/nyheter/b', 2 => 'eventyrer2017/news/c', 3 => 'eventyrer2017/nyheter/d', )
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 array ( 0 => 'eventyrer/news/a', 1 => 'eventyrer/nyheter/b', 2 => 'eventyrer2017/news/c', 3 => 'eventyrer2017/nyheter/d', )

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