There are multiple parameters which can be set when creating a cookie. This does not apply to only Perl and CGI but to all other development environments. The only required parameter we need to set cookie with is a cookie name.
Other parameter which should also be mentioned is a cookie expiry date. Some browsers would not even accept a cookie with no expiry date but mostly cookies with no expiration date are accepted and are saved for a current session only.
To create a cookie which will be saved for more than a single session a cookie expiration must be set. Use the following code Perl/CGI to create a cookie with:
#!/usr/bin/perl -T use strict; use CGI qw/:standard/; my $cookie = cookie( -name=>'CGI-PERL-COOKIE-EXAMPLE', value=>'cookie.linuxconfig.org', -expires=>'+1y'); print header (-cookie=>$cookie), start_html('CGI Cookie with Exipire Date'), p("Cookie had been saved !\n"), end_html; exit;
Save your code into /usr/lib/cgi-bin/expiry-date-cookie.cgi and make it executable:
# chmod 755 /usr/lib/cgi-bin/expiry-date-cookie.cgi
If your browser allows you to see all stored cookies you should be able to find your own cookie. Here is a screenshot of my cookie when using firefox browser.
To retrieve your cookie with Perl/CGI use a following code. Make sure that you set correct cookie name:
#!/usr/bin/perl -T use strict; use CGI qw/:standard/; my $retrieve_cookie = cookie('CGI-PERL-COOKIE-EXAMPLE'); print header, start_html, p("Cookie value is $retrieve_cookie\n"), end_html; exit;
The following code uses same principles of creating a cookies however on larger scale. When creating a cookies we need to keep in mind that there is a limitation of maximum 20 cookies per domain. Use a following code to create multiple cookies simultaneously. The code first creates a scalar variable to hold a cookies definitions and then we print a header with both cookies in form of array.
#!/usr/bin/perl -T use strict; use CGI qw/:standard/; my $cookie1 = cookie(-name=>'cookie_one',value=>'value1',expires=>'+1d'); my $cookie2 = cookie(-name=>'cookie_two',value=>'value2',expires=>'+10y'); print header (-cookie=>[$cookie1,$cookie2]), start_html('CGI Multiple Cookie Example'), p("Cookies received!\n"), end_html; exit;
Similarly the code below retrieves multiple cookies at once:
#!/usr/bin/perl -T use strict; use CGI qw/:standard/; my $retrieve_cookie1 = cookie('cookie_one'); my $retrieve_cookie2 = cookie('cookie_two'); print header, start_html, p("COOKIE_ONE Value: $retrieve_cookie1 \n"), p("COOKIE_TWO Value: $retrieve_cookie2 \n"), end_html; exit;