Need help sorting directory listing

[peppino]

Im creating a php page that reads a directory structure to be used as a menu system. i need to get all the directories and sub directories to be sorted alphabetically. i dont really have any idea where to start. im assuming i need to get all the data into a mulitidimensional array? help is much appreciated. below is the code im using.

header("Content-type: text/xml");

echo "<?xml version=\"1.0\"?>\n";
echo "<menu>\n";


function getDirectory($firstTry, $path = '.', $level = 1){ 
    $ignore = array( 'cgi-bin','content','images','pages', '.', '..' ); 
    // Directories to ignore when listing output. Many hosts 
    // will deny PHP access to the cgi-bin. 

$dh = @opendir( $path ); 
// Open the directory to the handle $dh 

while( false !== ( $file = readdir( $dh ) ) ){ 
// Loop through the directory 

    if( !in_array( $file, $ignore ) ){ 
    // Check that this file is not to be ignored 

        $spaces = str_repeat( '&nbsp;', ( $level * 4 ) ); 
        // Just to add spacing to the list, to better 
        // show the directory tree. 

        if( is_dir( "$path/$file" ) ){ 
        // Its a directory, so we need to keep reading down... 
            if($level < 2){
                if ($firstTry == 'false'){
                	echo "</category>\n";
                }elseif($firstTry == 'true'){
                	$firstTry = 'false';
                }
            	echo "<category Name=\"$file\">\n";
            	//echo "<strong>$spaces $file</strong><br />";
            	getDirectory('false',"$path/$file", ($level+1)); 
            } else{
            	echo "<subcat Name=\"$file\"/>\n";
                            //echo "-$spaces $file<br />";
            }
            // Re-call this same function but on a new directory. 
            // this is what makes function recursive.  
        } 
    } 
} 

closedir( $dh ); 
// Close the directory handle 

} 
getDirectory('true',"." ); 

echo "</category>\n
</menu>\n";