Installation
In order to use FTP functions with your PHP configuration, you should add the --enable-ftp option when installing PHP.
The Windows version of PHP has built-in support for this extension. You do not need to load any additional extensions in order to use these functions.
Коментарии
If you are using PHP 7 under Windows you have to enable ftp in php.ini with extension=php_ftp.dll.For some reason folks downvoted the previous entry for this, BUT... indeed, as of PHP 7, to enable this on Windows you have to add the line:
extension=php_ftp.dll
to your php.ini to resolve PHP errors that tell you PHP FTP functions are not defined; the line isn't in there (where, many things are and are just commented out).