PHP: casting to a dynamically determined type

I'd like do something like this:

$type = "int";
$casted = ($type)$value;

This doesn't work. But is there some other way to cast to a dynamically determined type?

Thanks

Use the settype() function.

>http://php.net/manual/en/function.settype.php

Example:

$type = 'int';
$var = '20';
settype($var, $type);
var_dump($var);