The Luhn Algorithm is a simple checksum formula that is used to verify a variety of different numbers including most credit cards. Outside of verifying funds it provides the most accurate means of verifying credit card numbers by preventing typographical errors.

When creating web pages and WSH scripts that send email it sometimes necessary to test the IIS SMTP service to ensure that it is properly handling and sending email. The technique I’ll be demonstrating today can be used locally or for testing the SMTP service on a remote server.

In early 2008, I created a simple PHP driven tool for changing the prefix on a MySQL table. The was originally designed to change the default prefix used by phpBB installations to help prevent SQL injection attacks. The tool has gained quite a bit of popularity and I’ve been receiving a lot of […]

Many scripters have gotten all too used to using the WScript object’s Sleep method for pausing or delaying script execution. Since this object isn’t available in ASP, Windows Script Components, or HTML Applications, programmers are required to create viable alternatives.

I receive this question quite frequently by readers who want to know how to configure Apache to treat HTML files as if they were PHP. Parsing HTML files as PHP can be quite handy if you have a current HTML site that you’re moving over to PHP and you don’t want to have to […]

One major caveat for most web developers is the font limitations you encounter on the web. Browsers can only display specific registered fonts because of the differences between browsers and platforms. There’s no way to bridge this gap and forcing visitors to download and install specialized fonts before viewing your site is not […]