multi dimensional arrays

Hi Guys, I am doing error checking here and have developed the following code to add errors to and $errors array. $errors[0] = "<span class=error>The following errors have occured:</span><br>&nbsp;<br>\n\n"; $errors[count($errors)] = This is an error that has occured.<br>\n"; $errors[count($errors)] = This is another that has occured.<br>\n"; This works fine, I then check to see if there are any errors and if so print them out: if (!$errors[1]) { // continue with code execution } else { $num_errors = count($errors); for ($idx = 0; $idx < $num_errors; ++$idx) { echo ("$errors[$idx]"); } echo ("<br>\nPlease click <a href=\"#\" onClick=\"backButton();\">here</a> to fix these problems");""; } But I want to do the same thing for a multidimensional array with the two upper types of arrays being critical and non-critical. I know I can make mutlidimensional arrays by the following: $errors = array("non-critical" => array("First non-critical error","Second non-critical error"), "critical" => array("first Critical Error", "Second Critical Error", "Third Critical error")); But I need to know how to add the array (and the currect sub-array) as I wish, like in the first example. Thanks for any help. Scott.