Attempts to retrieve the PHP version from a web server. PHP has a number of magic queries that return images or text that can vary with the PHP version. This script uses the following queries: * '/?=PHPE9568F36-D428-11d2-A769-00AA001ACF42': gets a GIF logo, which changes on April Fool's Day. * '/?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000': gets an HTML credits page. A list of magic queries is at http://www.0php.com/php_easter_egg.php. The script also checks if any header field value starts with ''PHP'' and reports that value if found. SYNTAX: http.pipeline: If set, it represents the number of HTTP requests that'll be pipelined (ie, sent in a single request). This can be set low to make debugging easier, or it can be set high to test how a server reacts (its chosen max is ignored). http.useragent: The value of the User-Agent header field sent with requests. By default it is ''Mozilla/5.0 (compatible Nmap Scripting Engine http://nmap.org/book/nse.html)''. A value of the empty string disables sending the User-Agent header field. http-max-cache-size: The maximum memory size (in bytes) of the cache.