Warning: before the download, check if your PHP installation is thread safe or non-thread safe typing this on Terminal:

php -i|findstr "Thread"

Next, proceed:

1. Download the right version of the extension https://pecl.php.net/package/amqp
2. After download, copy rabbitmq.4.dll and rabbitmq.4.pdb files to PHP root folder and copy php_amqp.dll and php_amqp.pdb files to PHP\ext folder
3. Add extension=amqp to the php.ini file
4. Check if is everything OK with php -m

It is miserable easy but I have stuck on this for almost two hours.