Note for Cygwin users: you may need to install the "php-iconv" package.
This extension is enabled by default, although it may be disabled by compiling with --without-iconv.
The optional --with-iconv[=DIR] directive is used to specify the location of iconv on the system that PHP is being compiled on, otherwise only the default locations are scanned.
Note for Cygwin users: you may need to install the "php-iconv" package.
Note for FreeBSD users: you may need to install the php56-iconv pkg.