Re: string initialization error

It looks like you set $page to "" and then possibly set it to undef in the following line if there is no query parameter named "page". By the time perl compares $page to 'main', it's getting an undef value.

You probably meant something like: my $page = $query->param("page") // '';

or: my $page = $query->param("page") || '';

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Re^2: string initialization error by haukex (Archbishop) on Dec 21, 2018 at 15:44 UTC
or: `my $page = $query->param("page") \|\| '';` Caveat: That will also assign `''` to `$page` if `$query->param("page")` returns `0` or `"0"` (the same applies to hippo's answer). TIMTOWTDI: Another alternative to the code from the OP may be (at least on Perl v5.12 and up): `sub loadPage { my $page = $query->param("page"); if ( length($page) && $page eq 'main' ) { loadMainPage(); return 1; } }` [download]	[reply] [d/l] [select]

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Re^2: string initialization error
by haukex (Archbishop) on Dec 21, 2018 at 15:44 UTC

or: my $page = $query->param("page") || '';

Caveat: That will also assign '' to $page if $query->param("page") returns 0 or "0" (the same applies to hippo's answer).

TIMTOWTDI: Another alternative to the code from the OP may be (at least on Perl v5.12 and up):

sub loadPage {
    my $page = $query->param("page");    
    if ( length($page) && $page eq 'main' ) {
        loadMainPage();
        return 1;
    }
}
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