Generating Random Passwords

Random (but difficult-to-guess) strings are important in user security. For example, if someone loses a password and you're using MD5 hashes, you won't be able to, nor should you want to, look it up.…

How to prevent hotlnik images from your site

This is an example of how to protect the site direct links to your images from another site. For example a web master can set the site with high traffic and loads directly from your server. What can lead…

PHP Safe Mode

PHP's Safe Mode attempts to provide a degree of basic security in a shared environment, where multiple user accounts exist on a PHP-enabled web server. When a web server is running PHP in Safe Mode, some…

PHP Forcing a User to Use SSL-Encrypted Pages

When handling credit card information, you want to guarantee that all card information always goes through an SSL (Secure Socket Layer) connection.

PHP Checking to See If a Users Browser Accepts Cookies

To see if a browser accepts cookies, you must check in two distinct steps, in two distinct web requests. The client's browser must make two requests because the browser sets a cookie only when it gets…