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Re: Unexpected CGI param behavior

by pc88mxer (Vicar)
on Jun 24, 2008 at 00:47 UTC ( #693640=note: print w/replies, xml ) Need Help??


in reply to Unexpected CGI param behavior

I think CGI implements this behavior so that param() can support both scalar and list context. In list context it returns all the values for a parameter and in scalar context it just returns the first value.

If it returned undef for unknown parameters, then this wouldn't work:

my @vals = $q->param('...'); print Dumper(\@vals); # would print [ undef ] not [ ]
That is, @vals would not be the empty list but a list containing undef.

A work-around is to use scalar:

my $var = { first => scalar $q->param('first'), second => scalar $q->param('second'), };

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