How to check if PECL extension is present?

Question

How do I from PHP code if a PECL extension is installed or not?

I want gracefully handle the case when an extension is not installed.

Answer 1

I think the normal way would be to use extension-loaded.

if (!extension_loaded('gd')) {
    // If you want to try load the extension at runtime, use this code:
    if (!dl('gd.so')) {
        exit;
    }
}

Answer 2

get_loaded_extensions fits the bill.

Use like this:

$ext_loaded = in_array('redis', get_loaded_extensions(), true);