Check if PHP extension is enabled

[andrewheiss]

I'm working on a site that is hosted on two different servers with (unfortunately) different PHP configurations. I use the PHP Tidy extension on my pages to clean up the mess that ensues after echoing out a whole bunch of dynamic content. One of my servers, though, doesn't have Tidy enabled, though.

Rather than comment out all the code references to tidy on one copy of the site, I'd like to keep it consistent and code in some test to see if tidy is enabled, kind of like checking for magic quotes with get_magic_quotes_gpc()==1.

Is there an easy PHP way to see if php_tidy.dll (or any other extension in php.ini, like mhash) is enabled?

[edited by: coopster at 3:57 pm (utc) on Mar. 3, 2008]
[edit reason] no edits made [/edit]

[phparion]

one simple check could be

$tidy = new tidy;
if($tidy) {
echo "success";
}
else {
echo "failure";
}

[andrewheiss]

I tried that earlier, but it doesn't work. It calls a fatal error:
"Fatal error: Class 'tidy' not found..."

Is there a way to catch that error so the rest of the script continues and incorporate the error result in the logic? For example, something like this:

$tidy = new tidy;
/* Concept of logic, not actual code
if (error) {
 no
 continue script
} else {
 yes
}
*/

[PHP_Chimp]

if ([url=http://uk.php.net/manual/en/function.function-exists.php]function_exists[/url](tidy)) {
$tidy = new tidy;
//
}
else {
echo 'This place is not tidy';
}

You may have to change the function that you search for to something like 'tidy_repair_string', as tidy itself may not show up as a function.

[edited by: PHP_Chimp at 2:59 pm (utc) on Mar. 2, 2008]

[coopster]

You can just use extension_loaded [php.net] too.

[andrewheiss]

Perfect! extension_loaded was what I needed.

Thanks!

[phparion]

extension_loaded is a nice addition to my knowledge. I wonder if I will ever be able to cram php manual :) so many functions...