Get Beginning Perl Web Development: From Novice to Professional PDF

By Steve Suehring

ISBN-10: 1590595319

ISBN-13: 9781590595312

Beginning Perl net improvement: From amateur to Professional introduces you to the realm of Perl net program improvement. This publication tackles all components the most important to constructing your first net functions and contains a strong mixture of real-world examples coupled with suggestion. subject matters diversity from serving and eating RSS feeds, to tracking net servers, to interfacing with e mail. You'll tips on how to use Perl with ancillary programs like Mason and Nagios.

Though no longer model particular, this publication is a perfect learn when you have had a few grounding in Perl fundamentals and now are looking to flow into the realm of net program improvement. writer Steve Suehring emphasizes the protection implications of Perl, drawing on years of expertise instructing readers find out how to "think safe," steer clear of universal pitfalls, and bring well-planned, safe code.

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Extra info for Beginning Perl Web Development: From Novice to Professional (Beginning: From Novice to Professional)

Sample text

Notice that the expiration of $cookie2 is different from that of the other cookie in this example. qxd 22 10/5/05 2:10 PM Page 22 CHAPTER 1 ■ THE CGI MODULE The second line of code looks strikingly similar to the call to the header() function from previous examples. Notice that this time, the call is setting two cookies, separated by a comma, within a set of brackets, which you’ll recognize as an anonymous array. As you might come to expect by now, trying to accomplish this same task without the help of the CGI module is possible but much more time-consuming.

As you might come to expect by now, trying to accomplish this same task without the help of the CGI module is possible but much more time-consuming. Reading the values from multiple cookies calls for the same process as reading one cookie (shown earlier in Listing 1-7), except that you read all of them! Listing 1-11 shows the code to read both of the cookies sent by the example in Listing 1-10. Listing 1-11. /usr/bin/perl -T use strict; use CGI qw/:standard/; my $retrievedcookie1 = cookie('testcookie'); my $retrievedcookie2 = cookie('secondcookie'); print header, start_html, p("You sent a couple cookies and their values were $retrievedcookie1 and ➥ $retrievedcookie2\n"), end_html; exit; This code has only two changes from the code to retrieve one cookie.

Instead of having to worry about the format or calculate the date in the future, you can simply call the expires() function of the cookie method with an argument indicating when the cookie will expire. Listing 1-9 shows an example that sets the same expiration date as Listing 1-8. Listing 1-9. /usr/bin/perl -T use strict; use CGI qw/:standard/; my $cookie = cookie(-name=>'testcookie',value=>'testcookievalue',-expires=>'+7d'); print header (-cookie=>$cookie), start_html('CGI Cookie Test'), p("You've received a cookie\n"), end_html; exit; Notice first that the code is much, much simpler.

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Beginning Perl Web Development: From Novice to Professional (Beginning: From Novice to Professional) by Steve Suehring

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