PHP: Unable to find the wrapper "https"

PHP may tell you the following:

PHP Warning: file_get_contents():
Unable to find the wrapper "https" - did you forget
to enable it when you configured PHP?

This means that PHP is not able to do secure HTTP requests. Reason for this is that it has no SSL library to use.

Unix​

Recompile PHP with the --with-openssl flag.

Windows​

Edit your php.ini file and add the following line:

extension=php_openssl.dll