create Table width two columns: Year,LatestNumber
function generateStudentId(){
$year = date("Y");
$latestNumber = 0;
$res = mysql_query("select * from myTable where Year=$year");
$result = mysql_fetch_array($res);
if($result)
$latestNumber = $result['LatestNumber'];
$latestNumber++;
if($result){
mysql_query("update myTable set LatestNumber=$latestNumber where Year=$year");
}
else
mysql_query("insert into myTable values($year,$latestNumber)");
$fiveDigitNumber = return str_pad((int) $latestNumber,5,"0",STR_PAD_LEFT);
$studentId = $year.$fiveDigitNumber;
return $studentId;
}