Question

I am using this function to display UL list:

function getList($arResult){
    $diff = 0;
    foreach($arResult as $result){
        if($lastlevel != $result[depth]){
        if($lastlevel < $result[depth]){
            $html .= "<ul>\n";
            $diff++;
        }
        else {
            $html .= "</li>\n</ul>\n</li>\n";
            $diff--;
        }       
        }
        else
        $html .= "</li>\n";

        $html .= "<li>$result[cat_name]";

        $lastlevel = $result[depth];
    }
    $html .= str_repeat("</li>\n</ul>\n", $diff);
    return $html;
    }

The $arResult contains a tree like this:

Electronics
  TV
  Video
    Old Movies
    New Movies
    Hollywood
      Old hollywood
      New HollyWood
      Rotten Hollywood
    Other Movies
  Mobile
    Nokia
    Apple
    Micromax
  Laptop
  Other

The above function prints everything under Electronics->Tv while the truth is that under Electronics there should be TV, Video, Mobile Laptop, Other ..

This function somehow is putting ul li in incorrect mode.

The Array Dump is here:

array(10) {
  [0]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "197"
    ["cat_name"]=>
    string(13) "Student Corner"
    ["cat_nicename"]=>
    string(13) "student-corder"
    ["parent"]=>
    string(1) "0"
    ["post_count"]=>
    string(1) "0"
    ["depth"]=>
    string(1) "0"
  }
  [1]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "198"
    ["cat_name"]=>
    string(6) "GujCET"
    ["cat_nicename"]=>
    string(13) "gujcet-gujrat"
    ["parent"]=>
    string(3) "197"
    ["post_count"]=>
    string(1) "0"
    ["depth"]=>
    string(1) "1"
  }
  [2]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "199"
    ["cat_name"]=>
    string(13) "Sample Papers"
    ["cat_nicename"]=>
    string(20) "sample-papers-gujcet"
    ["parent"]=>
    string(3) "198"
    ["post_count"]=>
    string(1) "1"
    ["depth"]=>
    string(1) "2"
  }
  [3]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "200"
    ["cat_name"]=>
    string(8) "Syllabus"
    ["cat_nicename"]=>
    string(15) "syllabus-gujcet"
    ["parent"]=>
    string(3) "198"
    ["post_count"]=>
    string(1) "8"
    ["depth"]=>
    string(1) "2"
  }
  [4]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "201"
    ["cat_name"]=>
    string(4) "News"
    ["cat_nicename"]=>
    string(11) "news-gujrat"
    ["parent"]=>
    string(3) "197"
    ["post_count"]=>
    string(1) "1"
    ["depth"]=>
    string(1) "1"
  }
  [5]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "202"
    ["cat_name"]=>
    string(13) "Question Bank"
    ["cat_nicename"]=>
    string(20) "question-bank-gujrat"
    ["parent"]=>
    string(3) "197"
    ["post_count"]=>
    string(1) "0"
    ["depth"]=>
    string(1) "1"
  }
  [6]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "203"
    ["cat_name"]=>
    string(7) "Class X"
    ["cat_nicename"]=>
    string(28) "class-x-gujrat-question-bank"
    ["parent"]=>
    string(3) "202"
    ["post_count"]=>
    string(1) "2"
    ["depth"]=>
    string(1) "2"
  }
  [7]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "204"
    ["cat_name"]=>
    string(9) "Class XII"
    ["cat_nicename"]=>
    string(30) "class-xii-gujrat-question-bank"
    ["parent"]=>
    string(3) "202"
    ["post_count"]=>
    string(1) "4"
    ["depth"]=>
    string(1) "2"
  }
  [8]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "205"
    ["cat_name"]=>
    string(7) "Results"
    ["cat_nicename"]=>
    string(15) "results-gujarat"
    ["parent"]=>
    string(3) "197"
    ["post_count"]=>
    string(1) "1"
    ["depth"]=>
    string(1) "1"
  }
  [9]=>
  array(6) {
    ["cat_ID"]=>
    string(3) "206"
    ["cat_name"]=>
    string(10) "About GSEB"
    ["cat_nicename"]=>
    string(10) "about-gseb"
    ["parent"]=>
    string(3) "197"
    ["post_count"]=>
    string(1) "1"
    ["depth"]=>
    string(1) "1"
  }
}

Answer 1

Way too complicated a function. Something along these lines does it:

function treeList(array $data) {
    $list = '<ul>';

    foreach ($data as $item) {
        $list .= '<li>';
        $list .= $item['name'];
        if (!empty($item['children'])) {
            $list .= treeList($item['children']);
        }
        $list .= '</li>';
    }

    $list .= '</ul>';

    return $list;
}

$data = array(
    array(
        'name'     => 'Foo',
        'children' => array(
            array(
                'name' => 'Bar'
            )
        )
    )
);

echo treeList($data);