PEAR module (HTTP_Request2) installed, but not recognized in php file?

Question

I have HTTP_Request2 installed on my server; pear list shows it in the list of installed packages. But the following php file:

<?php

ini_set("include_path", '/path/to/php:' . ini_get("include_path"));

if (class_exists('HTTP_Request2')) {
    print("true");
} else {
    print("false");
}

...returns false. I've also tried replacing the ini_set line with

include '/path/to/php/HTTP/Request2.php';

...but I get the same result. Is there something I'm missing, or something else I can check?

Answer 1

Simply setting the include path doesn't implicitly give you access to the code. You need to either set the include path and then use relative includes:

ini_set("include_path", ...);
require_once 'HTTP/Request2.php';

Or just use fully qualified includes:

require_once '/path/to/HTTP/Request2.php';

That said, HTTP_Request2 is kinda old and I'd instead recommend using something like Guzzle via composer.