Online PHP editor | output for QUtVj

<?php $array = [ (object)['Dep_name' => 'Accounting and Finance', 'dep_id' => 1, 'dep_parent_id' => 0], (object)['Dep_name' => 'Human-Recources', 'dep_id' => 2, 'dep_parent_id' => 0], (object)['Dep_name' => 'IT', 'dep_id' => 3, 'dep_parent_id' => 0, 'children' => [ (object)['Dep_name' => 'Network', 'dep_id' => 5, 'dep_parent_id' => 3], (object)['Dep_name' => 'Web Development', 'dep_id' => 6, 'dep_parent_id' => 3, 'children' => [ (object)['Dep_name' => 'Front-End', 'dep_id' => 7, 'dep_parent_id' => 6], (object)['Dep_name' => 'Back-End', 'dep_id' => 7, 'dep_parent_id' => 6], ] ], ] ], (object)['Dep_name' => 'Marketing', 'dep_id' => 4, 'dep_parent_id' => 0, 'children' => [ (object)['Dep_name' => 'web-marketing', 'dep_id' => 9, 'dep_parent_id' => 4], ] ] ]; function printTree($array) { $output = "<ul>\n"; foreach ($array as $a) { $output .= "<li>".$a->Dep_name."</li>\n"; if (isset($a->children)) { $output .= printTree($a->children); } } $output .= "</ul>\n"; return $output; } echo printTree($array);