Server-Side Scripting/Iteration/PHP

index.php
";   return $result; }

function process_fahrenheit($start, $stop, $increment) { $result = " Temperature Conversion "; $result = $result. " ";   return $result; }

?>

Try It
Copy and paste the code above into the following free online development environment or use your own compiler / interpreter / IDE.
 * PHPFiddle
 * Repl.it