From php multidimensional array trying to create ul li nested menu (unlimited nested levels)

Question

Here is what I got http://codepad.org/iDoXXsLX

Have an array like this

Array ( [0] => Array ( [NumberRenamed] => 17 [TopicName] => Products [UpperLevelNumberRenamed] => 0 ) [17] => Array ( [0] => Array ( [1] => Array ( [NumberRenamed] => 18 [TopicName] => Computers [UpperLevelNumberRenamed] => 17 ) ) ) [18] => Array ( [0] => Array ( [2] => Array ( [NumberRenamed] => 16 [TopicName] => Laptops [UpperLevelNumberRenamed] => 18 ) ) ) [16] => Array ( [0] => Array ( [4] => Array ( [NumberRenamed] => 8 [TopicName] => Dell [UpperLevelNumberRenamed] => 16 ) ) ) ) 

Products top-level item, the first Computers sublayer element, the next sublayer is Laptops , then again the next Dell sublayer

For each element of the universe, UpperLevelNumberRenamed == to the nearest top level NumberRenamed .

Want to get this result

 Products Computers Laptops Dell Acer Desktops Home 

Tried this

 foreach( $main_topics as $k_main_topics => $v_main_topics ){ if( isset($v_main_topics['UpperLevelNumberRenamed']) and $v_main_topics['UpperLevelNumberRenamed'] == 0 ){ //print only top level topics echo $v_main_topics['TopicName']. '<br/>'; } else{//if not top level topic foreach( $v_main_topics[0] as $k_v_main_topics_0 => $v_v_main_topics_0 ){ echo $v_v_main_topics_0['TopicName']. '<br/>'; }//foreach( $v_main_topics[0] as $k_v_main_topics_0 => $v_v_main_topics_0 ) }//else{ }//foreach( $main_topics as $k_main_topics => $v_main_topics ) 

But get it

 Products Home Computers Laptops Desktops Dell Acer 

Something is wrong, but I can’t understand. Please advice what needs to be fixed / changed in the code

Trying another way

The starting array is a one-dimensional array. Trying to get navigation navigation from one size.

Here is what I did http://codepad.org/OLtxyL4X

Answer 1

Here is a summary of what he does:

• smooth array recursively
• build a map of multidimensional relationships.
• create 1D relationships that bind UpperLevelNumberRenamed to NumberRenamed
• print multidimensional list ul-li.

Here he is:

 $flat = array(); foreach (new RecursiveIteratorIterator(new RecursiveArrayIterator($main_topics)) as $i) $flat[] = $i; $final = array(); $defs = array(); for ($i = 0; $i < count($flat); $i += 3) if ($flat[$i + 2] == 0) { $final[$flat[$i + 1]] = array(); $defs[$flat[$i]] = &$final[$flat[$i + 1]]; } else { $defs[$flat[$i + 2]][$flat[$i + 1]] = array(); $defs[$flat[$i]] = &$defs[$flat[$i + 2]][$flat[$i + 1]]; } function array2ul($array) { $out = "<ul>"; foreach($array as $key => $elem) $out = is_array($elem) ? $out . "<li><span>$key</span>" . array2ul($elem) . "</li>" : $out = $out."<li><span>$key:[$elem]</span></li>"; $out = $out . "</ul>"; return $out; } echo array2ul($final); 

Output :

 <ul><li><span>Products</span><ul><li><span>Computers</span><ul><li><span>Laptops</span><ul><li><span>Dell</span><ul></ul></li><li><span>Acer</span><ul></ul></li></ul></li><li><span>Desktops</span><ul></ul></li></ul></li></ul></li><li><span>Home</span><ul></ul></li></ul> 

Answer 2

This should be a working example using recursion, but not tested:

Define an array

  $main_array = Array ( '10' => Array ( 'name' => 'Products' 'children' => Array ( '12' => Array ( 'name' => 'Laptop', 'children' => Array ( '13' => Array ( 'name' => 'Dell', ), '14' => Array ( 'name' => 'Acer', ) ) ) '14' => Array ( 'name' => 'Desktop', 'children' => Array ( '15' => Array ( 'name' => 'Sony', ), '16' => Array ( 'name' => 'Apple', ) ) ), ) ) ) 

Create and call the function:

  function createList($main_topics) { if($main_topics == null || sizeof($main_topics) <= 0) { return ''; } $list = '<ul>'; foreach($main_topics as $k_main_topics => $v_main_topics ) { $list .= '<li id="' . $k_main_topics'"> '. $v_main_topics['name'] . ' ' . createList(isset($v_main_topics["children"]) ? $v_main_topics["children"] : null) . '</li>' ; } $list .= '</ul>'; return $list; } echo createList($main_array);