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    <p>The "obsolete"-ness of CGI is really only a factor if you are doing big, complex sites with lots of page views. </p> <p>Many people push the idea that CGI is obsolete don't really understand what CGI is. There is a widespread misconception that CGI is an inherently Perl-based technology. Many people attack CGI as a way to pad out cultic attacks on Perl in support of whatever language they support. If you want to be a real technologist, you need to understand the fundamental issues and make a choice based on the facts of the situation.</p> <p>CGI is an interface with a webserver that allows you to write interactive pages in any language--<a href="http://quadium.net/funge/name.bf" rel="noreferrer">even befunge</a>. When a server gets a request for a page controlled by a CGI script, the server runs the script and returns the results to the requester.</p> <p>If your programming language requires a VM, interpreter or compiler to load each time it executes, then this start-up time will be required each time your page is accessed.</p> <p>CGI accelerators like FastCGI, mod_php, mod_perl and so forth, keep an interpreter/VM in memory at all times, may keep libraries loaded, and even cache bytecode from scripts to reduce script start-up overhead.</p> <p>If you are making a simple, personal or hobby site, CGI will be fine. So will PHP.</p> <p>If your site should grow to need a faster technology, you can move to mod_perl, FastCGI, or other CGI acceleration technologies.</p> <p>What language you use should be determined by the tools it provides and how they fit with your needs. </p> <ol> <li>Make a list of the capabilities you need. </li> <li>Make a list of deal breakers. </li> <li>Now check each of your possible toolsets against these two lists. </li> <li>Which one comes out the best? Test it.</li> <li>Does it suck? Cross it off your list, and go back to step 4.</li> </ol> <p>Also, I recommend against using <a href="http://en.wikipedia.org/wiki/Befunge" rel="noreferrer">befunge</a>. Just because it is possible, it doesn't mean you should use it.</p> <hr> <p><strong>Update:</strong> As mpeters points out, mod_perl, mod_php, mod_ruby, et alia are much more than mere CGI accelerators; they provide access to the Apache API. They act as CGI accelerators, but can do much, much, more.</p> <p>FastCGI is a pure CGI accelerator.</p> <p><strong>Update 2:</strong> PHP and CGI are not mutually exclusive. <a href="http://us3.php.net/security.cgi-bin" rel="noreferrer">PHP can be installed as a CGI</a>. PHP is often used with FastCGI.</p>
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    1. POWhen should I use Perl CGI instead of PHP (or vice versa)?
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    1. COWhile most of this is correct, mod_perl is not just a CGI accelerator. In fact, that's kind of a side-affect of giving you the ability to control every bit of the Apache request cycle in Perl.
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    2. COAmen. Especially the "CGI is language-agnostic" bit - the first CGI library I've ever written was actually in C as a consulting gig (that was back in college days when I was very good with C but somehow managed to never have heard of Perl :)
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