Question

I have a table with two fields, named credithour and gradepoint.

I want to add the data from each row of credithour with gradepoint.

My code :

$totalcredithour = 0;                           
$GPA = "SELECT * FROM $dept_stu_id WHERE sessionyear = '$sessionyear'" or die (mysql_error());
$resultGPA = mysql_query($GPA);
while($data = mysql_fetch_array($resultGPA))
{ 
    $credithour = "$data[credithour]";
    $gradepoint = "$data[gradepoint]";
    echo $totalcredithour += $credithour;   
}

What am I doing wrong?

It added data, but showing the first credit hour also besides result.
Suppose, here i entered two data 3 and 5. When I run this code it echo 38. Which means “3+5=8” and 1st credithour = “3”.

Answer 1

Actually other answer are wrong, you’re doing or die(mysql_error()); next to a string, that’s not right.

Your code should be like this..

$totalcredithour = 0;                           
$GPA = "SELECT * FROM `".$dept_stu_id."` WHERE sessionyear = `".$sessionyear."` ";
$resultGPA = mysql_query($GPA) or die(mysql_error());
while($data = mysql_fetch_array($resultGPA, MYSQL_ASSOC))
{ 
    $credithour = $data['credithour'];
    $gradepoint = $data['gradepoint'];

    echo $totalcredithour += $credithour; //Make sure `$totalcredithot` isn't null/doesn't exist.
}