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fun(-url => $httpRefer ); is not a “hash assignment.”   The => symbol in this case is equivalent to a comma.   Subroutine fun is being called with an argument-list containing two arguments:   -url, and the value of $httpRefer.

Some subroutines are written to recognize and to assign particular meanings to parameters which begin with a dash, e.g. to disambiguate user-chosen arbitrary strings which otherwise might match “real” parameters for the function.   (I, the author, decree that ... “Anything beginning with a dash is a literal.”)   But, that is up to their authors, not Perl itself.


In reply to Re: What does the dash before hash assignment means? by sundialsvc4
in thread What does the dash before hash assignment means? by anaconda_wly

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