Arithmetic in PHP

[jmg498]

I'm not quite used to the syntax of performing arithmetic operations on variables in PHP. Below is my code. I think it's pretty obvious what I'm trying to do based on the code, but I just don't know how to format it correctly in PHP.

Any help is GREATLY appreciated! $temp is a variable passed in by a form.

<?php

if($temp > "271.16") {
$ratio == "12+2*(271.16-$temp)";
}
$ratio == "12+(271.16-$temp)";

print "The snow to liquid ratio is $ratio";

?>

 

[jmg498]

Nevermind, figured it out!

<?php

if($temp > "271.16") {
$ratio = 12+2*(271.16-$temp);
}
$ratio = 12+(271.16-$temp);

print "The snow to liquid ratio is $ratio";

?>

This thread can be deleted. Thanks!

 

[Foamcow]

You don't need to put quotes around numbers. Your conditional still has them.

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