After uncommenting the curl-modul in the php.ini i get the following error:
PHP Warning: PHP Startup: Unable to load dynamic library 'C:\Program Files (x86)\EasyPHP-Devserver-16.1\eds-binaries\php\php5617x160120145639\ext\php_curl.dll' - Das angegebene Modul wurde nicht gefunden.\r\n in Unknown on line 0
This as, Anar Hariyev states, works:
100% working solution, I won this problem!
1) Copy libssh2.dll from php directory to Windows/system directory
2) In php.ini #zend_extension remove (;) front row ;extension=php_curl.dll
3) Restart Apache server.
However, you can copy libssh2.dll into Apache's bin folder as opposed into the Windows System directory. This keeps the server portable.