Locate available (not loaded) PHP extensions

Question

I need a way to find all the available PHP extensions whether they are loaded or not. I looked at How do I see the extensions loaded by PHP? but it only explains h

Answer 1

One way is to check the 'extension_dir' value:

phpinfo();

Then scan the directory to see the files:

$exts = scandir("/usr/lib/php5/extension_dir/");
print_r($exts);