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    copied!<p>I don't know the full usecase, but it seems that a simple recursive function would do the trick here. I've used ul/li to establish the multiple levels, but that is of course not required -- for example, I also included a function that will give you a flat array with the tasks listed in order.</p> <p>First, the HTML version:</p> <pre><code>function listTasks($list, $level=0) { print '&lt;li&gt;'.$list['task_id'].' - '.$list['task_name']; if (array_key_exists('sub_task_id', $list)) { print '&lt;br&gt;&lt;ul&gt;'; foreach ($list['sub_task_id'] as $subtasks) { listTasks($subtasks, $level+1); } print '&lt;/ul&gt;'; } print '&lt;/li&gt;'; } print '&lt;ul&gt;'; foreach ($a as $tasks) { listTasks($tasks, 1); } print '&lt;/ul&gt;'; </code></pre> <p>Sample output: </p> <pre><code>1123 - Main Task 1124 - sub Task 1-1 1125 - sub Task 1-1-1 1127 - sub Task 1-2 1126 - Main Task 2 </code></pre> <p>Generate a flat array:</p> <pre><code>function listTasks($list, &amp;$output, $level=0) { $output[] = array( 'id'=&gt;$list['task_id'], 'name'=&gt;$list['task_name'], 'level'=&gt;$level ); if (array_key_exists('sub_task_id', $list)) { foreach ($list['sub_task_id'] as $subtasks) { listTasks($subtasks, $output, $level+1); } } } $output = array(); foreach ($a as $tasks) { listTasks($tasks, $output); } </code></pre> <p>Output: </p> <pre><code>Array ( [0] =&gt; Array ( [id] =&gt; 1123 [name] =&gt; Main Task [level] =&gt; 0 ) [1] =&gt; Array ( [id] =&gt; 1124 [name] =&gt; sub Task 1-1 [level] =&gt; 1 ) [2] =&gt; Array ( [id] =&gt; 1125 [name] =&gt; sub Task 1-1-1 [level] =&gt; 2 ) [3] =&gt; Array ( [id] =&gt; 1127 [name] =&gt; sub Task 1-2 [level] =&gt; 1 ) [4] =&gt; Array ( [id] =&gt; 1126 [name] =&gt; Main Task 2 [level] =&gt; 0 ) ) </code></pre>
 

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