I was using this code to fetch a CGI parameter:

$page = int(param('page'));

This sometimes results in:

warning: Use of uninitialized value in int

Is this a good solution to resolve this warning, or is better and more succinct code available?

if (defined param('page')) {
    $param_page = int(param('page'));
} else {
    $param_page = 1;
  • \$\begingroup\$ What is the param function? \$\endgroup\$ Jun 15, 2016 at 20:50
  • \$\begingroup\$ I have use CGI qw/:standard/ at the top of my script which imports the param() function. param() gets a value from the query string. \$\endgroup\$ Jun 15, 2016 at 20:53

1 Answer 1


Standard practice is to scope variables using my.

Since Perl 5.10, the preferred way to write this is to use the logical defined-or operator to provide a default value when undef is encountered.

my $param_page = int(param('page') // 1);
  • 2
    \$\begingroup\$ By the way, if you think you should interpret an erroneous "0" parameter value as page 1, then you should use the || operator instead. \$\endgroup\$ Jun 15, 2016 at 21:05

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