PHP Exif Extension: GoClixy uses this extension to check the orientation of an image uploaded through iPhone.
PHP ICONV (php-iconv): For Captcha
PHP ZIP: For Bulk Import/Export and Version Files Update
PHP Curl Extension: CURL is a PHP extension that allows PHP to open files that are not stored on the same server as the PHP script. This is essential when importing, because script needs to connect to GoClixy server for future updates.
URL Rewriting: Search engines do not index site in depth if it contains links to dynamic pages. Besides, visitors also find it difficult to get back to their favourite url without URL rewriting functionality. mod_rewrite module makes it easier for users to find the page from dropdown list as they type into the address bar.
Caching: Caching helps a Web site to load faster, and save load on server and Internet link. GoClixy uses Zend to cache data that is constantly being accessed.
PHP Finfo Extension: For File Manager Thumbnail Generation (the mime_magic extension must be set to on).