A log file containing the IP addresses and whether they could be proxies, gets generated. Rex can also check if an array of POST or GET values contains HTML excerpts with Javascript that could be used to perform XSS (Cross-site scripting) attacks.

Requirements:
PHP 5.0 or higher

What's New in This Release Rex:
- Proxy port scan can be disabled (in some cases, it blocks users that have port 80 open in their router configuration)
- Added checkspamcop() that checks if a user IP is registered as spammer on Spamcop.net (can be enabled/diabled)
- Function filtraxss() renamed to checkxss() because it really checks the presence of malicious xss doesn't filter anything
- Function checkxss() only accepts arrays
- Added filterxss() that removes or disables tags
- Added checksize_db_data() that can be used to check for data size before inserting in database
- Added filtersql() that escapes special characters in a string for use in a SQL statement
- Portuguese variables renamed to english for better understanding the code to a larger community