Hi,
What is difference between $_Test[_Var1] V.S. $_Test_Var1?

Ex.:

$_Test[_Var1]= ...
$_Test[_Var2]= ...
$_Test[_Var3]= ...

V.S.

$_Test_Var1= ...
$_Test_Var2= ...
$_Test_Var3= ...

Thanks for answer .