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how to populate PHP multidimensional array and add the attributes to the category heading nodes, I have the following Books array $book = array( "language"=> array("English","Franch","Arabic"), "Programming"=> array("PHP","JAVA","C++"), "Science"=> array("Physics","Geography","Math"), ); function treeView($book){ $markUp = ""; foreach($book as $cate => $subj){ $markUp .= "<li>".((is_array($subj))?$cate.treeView($subj):$subj)."</li>"; } return "<ul>$markUp</ul>"; } treeView($book); //------------------- The result is what I expected language English Franch Arabic Programming PHP JAVA C++ Science Physics Geography Math I want to do the following (adding class) <ul> <li class="language">language <ul> <li>English</li> <li>Franch</li> <li>Arabic</li> </ul> </li> <li class="Programming">Programming <ul> <li>PHP</li> <li>JAVA</li> <li>C++</li> </ul> </li> <li class="Science">Science <ul> <li>Physics</li> <li>Geography</li> <li>Math</li> </ul> </li> </ul> Your help is highly appreciated Thank you.