Recently a site called The Twelve Factor App surfaced as a guideline for web applications to be at their best. Bradley Holt has taken these suggestions and has applied them to PHP applications in a few quick comments to each point.

If you develop web apps, I encourage you to check out The Twelve-Factor App. This is an excellent resource for anyone building and deploying software-as-a-service. PHP has great support for many of the twelve-factors. I want to take a look at specifically how each factor may be applied to a PHP application.

Some of the points the Twelve-Factor App makes aren't entirely relevant to PHP (like "Backing Services") but Bradley gets into details on others, providing technology that can be used to fill the need.

SToyan Stefanov has posted some examples of what sort of output can be made with the imagefilter function in PHP.

Here's the list of filters he applies:

• Brightness
• Grayscale
• Contrast
• Colorize
• Edge Detect
• Emboss
• Gaussian Blur
• Selective Blur
• Mean Removal
• Smooth
• Negate

And, as a sort of a bonus, he includes a lazy way to make your image look like it's sepia toned.