[imaginemn]

This one is a little tough because I do not know if $actual_answer is a number or a string. If it's a string I would probably use the strcmp(str1, str2) command instead.

In reality there is nothing wrong with the code that was submitted. I guess we would need to see the rest of the code because the function does work. I added a print command to see what was being displayed and in this example the first output is 3 and the second is 4.

$actual_answer = "Don't know";
$answers[0] = "Yes"; 
$answers[1] = "No";
$answers[2] = "Don't know";

$results[0] = "2";
$results[1] = "7";
$results[2] = "3";

$set_num = 0; 
while ( $answers[$set_num] != "" ) 
{ 
        if ( $answers[$set_num] == $actual_answer ) 
        { 
		print $results[$set_num];
		print "<BR>";

		$results[$set_num]++; 

		print $results[$set_num];
		print "<BR>";
        } 
        $set_num++; 
} 
unset($set_num);