Tryit Editor v2.3

PHP Source:

<!DOCTYPE html>
<html>
<body>

<?php
echo(cosh(3) . "<br>");
echo(cosh(-3) . "<br>");
echo(cosh(0) . "<br>");
echo(cosh(M_PI) . "<br>");
echo(cosh(2*M_PI));
?>

</body>
</html>

Result: