PHP function not returning string

[Datka]

I have constructed a function that takes a filename, and increments a counter in the filename and returns it, however, everything is correct, except the return does not return the filename.Any help, please?My code:\[code\]$filename = join("", array_reverse($date));$filename .= ".xml";$dir = "../gigs";$file = $dir."/".$filename;function getNewFileName($filename, $dir) {if (is_file("$dir/$filename")) { if (strpos($filename, "_") === false) { $filename = str_replace(".xml","_1.xml",$filename); getNewFileName($filename, $dir); } else { $pos = strpos($filename, "_"); $counter = (int)substr($filename, $pos+1,1); $counter++; $filename = substr($filename,0, $pos)."_".$counter.".xml"; getNewFileName($filename, $dir); } } else { // echoing HERE shows that the string is manipulated correctly return (string)$filename; // but returning here is not working }}echo getNewFileName($filename, $dir); // <- this last line prints nothing out\[/code\]Thanks in advance.