View difference between Paste ID: ATxULRSR and pt53Z4cb

 $list = array(
     1 => (object)array(
         'id' => 1,
         'parent' => 0
     ),
     2 => (object)array(
         'id' => 2,
         'parent' => 0
     ),
     3 => (object)array(
         'id' => 3,
         'parent' => 2
     ),
     4 => (object)array(
         'id' => 4,
         'parent' => 2
     ),
     5 => (object)array(
         'id' => 5,
         'parent' => 2
     ),
     6 => (object)array(
         'id' => 6,
         'parent' => 5
     ),
 );
 
 $arr = array();
-	if ($leaf->parent !== 0) {
+
-		$list[$leaf->parent]->children[] = $leaf;
+    if ($leaf->parent !== 0) {
-        unset($list[$leaf->id]);
+        $list[$leaf->parent]->children[] = $leaf;
-	}
+
     } else {
         $arr[] = $leaf;
-echo "<pre>"; print_r($list); echo "</pre>";
+    }
 }
 
 echo "<pre>"; print_r($arr); echo "</pre>";