A file handle as returned by fopen().
The class name, as a string.
$fh = fopen("/tmp/example","w");
// you must write DB_common before DB_mysql, as DB_mysql extends DB_common.
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
This function does not perform dependency checking, so make sure you
write the classes in an order that will not result in an
undefined class error occurring when you load it.