admin/environment/php extension/zip

The native PHP zip extension is required to let Moodle 2 read or write ZIP compressed archives.

Installation on Linux Systems

If your distribution doesn't include this extension by default, then you need to compile PHP yourself and include --enable-zip.

This general PHP configuration will work well with Moodle 2.0:

./configure  --with-apxs2=/usr/sbin/apxs --enable-mbstring --with-mysql=/usr --with-pear --enable-sockets 
             --with-gd --with-jpeg-dir=/usr --with-ttf --with-freetype-dir=/usr --with-zlib-dir=/usr 
             --with-iconv --with-curl --with-openssl --with-mysqli --enable-soap --with-xmlrpc --enable-zip

Installation on Windows Systems

Uncomment this line in your php.ini:

 extension=php_zip.dll