how to echo the highest value out of a variable

I find the percentages of correct answers with the following code:

$per = ($row['correct'] / ($row['correct'] + $row['incorrect']))*'100';

When I echo $per, I naturally get a list. What I actually want is to echo only the highest value out of that list. How can I do that? Is it possible to make $per an array variable?

 

$highest =0;
if ($per>$highest) {
 $highest = $per;
}
echo $highest;

PHP:

 

No change. It doesn't work. It results in the same way as echo $per would.

 

could you post the full code? / the code of that bit?

$highest =0;
while ($row = mysql_fetch_array($query)) {
$per = ($row['correct'] / ($row['correct'] + $row['incorrect']))*'100';
if ($per>$highest) {
 $highest = $per;
}
}
echo $highest;

PHP:

 

Here it is:

while($row = mysql_fetch_array( $result )) {

if($row['incorrect'] > '0') {     //to avoid dividing by zero
$per = ($row['correct'] / ($row['correct'] + $row['incorrect']))*'100';

echo $per, "<br>";

}
}

PHP:

 

$highest =0;
while($row = mysql_fetch_array( $result )) {

if($row['incorrect'] > '0') {     //to avoid dividing by zero
$per = ($row['correct'] / ($row['correct'] + $row['incorrect']))*'100';
if ($per>$highest) {
 $highest = $per;
}
//echo $per, "<br>";

}
}
echo $highest;

PHP:

 

Perfect! Thank you very much. It worked.

 

wow easy coding info. Thanks