Loop through multi-dimensional array and remove certain keys

Question

I\'ve got a nested tree structure which is based on the array below:

Array
(
    [1] => Array
        (
            [id] => 1
            [parent] => 0
            [n         


        

Answer 1

Solved it! Added this function to my class:

private function cleanTree(&$arr){
    foreach($arr as $key => &$item) {
        if(!$item["child"] && empty($item["basename"])){
            unset($arr[$key]);


    }elseif(is_array($item["child"])){
        if(count($item["child"]) == 0){
            unset($arr[$item["id"]]);
        }else{
            $this->cleanTree($item["child"]);
        }
    }
}


}

To remove unnecessary elements on the ROOT level(s) as well as anyone else, just run the above twice.

Answer 2

Rather than putting the test for which elements to destroy in the search function, pass a function to test for targets.

function searchAndDestroy(&$a, $targetp){
    foreach($a as $k => &$v){
        if(is_array($v)){
            searchAndDestroy($v, $targetp);
        } 
        if ($targetp($k, $v)) {
            unset($a[$k]);
        }
    }
}

searchAndDestroy($menu, function ($k, $v) {
        return is_array($v) 
            && array_key_exists('basename', $v) && empty($v['basename'])
            && (empty($v['child']) || count($v['child']) == 0);
    });

For PHP < 5.3 (or if you call searchAndDestroy with that function in more than one spot), name the function and pass the name rather than an anonymous function.