Online PHP editor | refs for uOOHT

<?php $root = array( 1=>'cat1', 2=>'cat2', 3=>'cat3' ); $child_1 = array( 1=>'sub_cat1', 2=>'sub_cat2', 3=>'sub_cat3' ); $child_2 = array( 1=>'sub_sub_cat1', 2=>'sub_sub_cat2', 3=>'sub_sub_cat3' ); function getAllCombinationsArray($source_arrays = array(), $key = '', $value = ''){ $return = array(); $current = array_shift($source_arrays); foreach($current as $ck => $cv) { if(!empty($source_arrays)) { $return += getAllCombinationsArray($source_arrays, $key.$ck.'_', $value.$cv.' -> '); } else { $return[$key.$ck] = $value.$cv; } } return $return; } print_r(getAllCombinationsArray(array($root, $child_1, $child_2)));