I'm clearly doing something wrong. I ported this piece of code from one I wrote in VBScript (where it works great), but I'm not as familiar with php syntax. Hopefully you can see where I'm going with this. I want to end up with a variable that contains the string of Sh0413C

Code:
$monthCode = array("02", "03", "04", "06", "09", "10", "10", "11", "11", "12", "12", "01");
$monthLetterCode = array("A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "L", "M");

$realMonthCode = date("n"); 
$labelYearCode = date("y");
$arrayMonthCode = $realMonthCode - 1;
$labelMonthCode = $monthCode(arrayMonthCode);
$labelLetterCode = $monthLetterCode(arrayMonthCode);
$myString = "Sh" . $labelMonthCode . $labelYearCode . $labelLetterCode;