oracle perl是什么意思,Perl中@_的含义是什么？

Any arguments passed in show up in the

array @_ .

Therefore,if you called a function with two arguments,those

would be stored in $_[0] and $_[1].

The array @_ is a local array,but its

elements are aliases for the actual scalar parameters.

In particular,if

an element $_[0] is updated,the

corresponding argument is updated (or

an error occurs if it is not

updatable).

If an argument is an array or hash element which did not exist when the function was called,that element is created only when (and if) it is modified or a reference to it is taken. (Some earlier versions of Perl created the element whether or not the element was assigned to.) Assigning to the whole array @_ removes that aliasing,and does not update any arguments.