Is Mac OS X Server 10.6 (Snow Leopard) rejecting your e-mail messages which lack a subject line? Mine was, and so does the default setting on Snow Leopard Server. Here’s a quick fix: 1) First, stop the mail service. 2 Now, you’ll want to edit the header_checks file that’s utilized by postfix. /^subject: *$/ REJECT [...]

Defining session timeout thresholds for PHP scripts is a security “must”. I recommend that you consider the purpose of your script before applying a session timeout function. For instance, if your site has a secure login and security requirements, it’s important to include the timeout function. However, it’s often an inconvenience to end-users. Use the [...]

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If you don’t backup your databases regularly, shame on you. You should! The code below will allow you to generate a backup as often as you’d like. It only makes sense to run this via a CRON job. This is pretty easy to do and you can set the frequency as you wish. The backup [...]

There are many practical and frequently used methods requiring a random record to be called. For instance, when you see “featured profiles” or random customer comments on a website, they are most likely using a function to call a random record. In addition, this function can allow you to display data in a random order. [...]

XSS attacks plague beginner programmers and are a significant vulnerability for commercial web hosts & website operators.  XSS means “cross-site scripting“.  These exploits work on the client side. Often, hackers put some type of JavaScript in content that users submit that allow them to steal the data from a cookie.  XSS attacks are pretty difficult [...]

This tutorial demonstrates how to execute an external PHP function by clicking a simple link within HTML.  The method uses AJAX so that the page doesn’t refresh and doesn’t require a form submission. 1) Paste the following code into a .js file.  For demonstration purposes, we have named it “ajax_click.js”. /* * ajax_click.js * chriscook.me [...]

I’ve uploaded one of my first applications for a Mac. It’s extremely easy to use. The tool allows you to lock your desktop when you’re away from the computer and requires a password when you get back.  This is something you can run on demand, instead of waiting for a screen-saver, or logging off.  Lock [...]