How to check data type in @_ ?

[LI NGOK LAM]

I am going to write a sub accept different types of data type.
My interface is some what like this :

$ret = mySub ( \%hash );
$ret = mySub ( [EMAIL PROTECTED] );
$ret = mySub ( \$calar );
$ret = mySub ( \&Sub );
$ret = mySub ( $calar );
$ret = mySub ( %hash );
$ret = mySub ( @rray );

Is there anyway I can check what is the data type 
for each element inside @_ ?

TIA