cgi - Perl crypt() acting weird -

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Once I'm using the function below to create a hash for download link (originally from prelomax) weird thing It is that I always get the same hash result.

I'm RTFMing I've ensured that the crypt () function gets the last 8 characters of $ EXP, and $ EXP actually verifies changes too. I manually encrypt the crypt () function Have tried to feed with random values, only those people have done the right thing and hash result has changed.

What am I missing here? 

  Strict use; Use CGI; Sub Chash {My $ exp = $ _; My $ key = 'abcd1234'; // is not real $ my hash = crypt (substr ($ exp, -8,8), $ key); $ Hash = substart ($ hash, 2); $ Hash = ~ s / [^ a-zA-Z0- 9] // g; $ Hash = UK ($ hash); Return $ hash; } $ Exp = time () + 60; My $ hash = wrench ($ EXP); My $ download_url = "http://script.pl?$exp-$hash";    
 
 
 You want to drag items before  @_  Instead of trying to read  $ _  in the sub  
  my $ exp = shift;   
 or  
  My ($ exp) = @_;   
 or  
  my $ exp = $ _ [0]; From   
 to:  
 
 Any argument that is shown in the array  @_ . Therefore, if you call functions with two arguments, then they will be stored in  $ _ [0]  and  $ _ [1] . The array  @_  is a local array, but its elements are nicknames for the actual scalar parameter.

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