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In addition to www canonicalization, you can also canonicalize the HTTP protocol, redirecting HTTP to HTTPS (or vice versa) with .htaccess.
Depending on your server configuration, getting correct path information can be challenging. For example, PHP does not provide a variable that will return the the base URL of your site. To help out, you can use the following code snippets to get the absolute path, document root, and base URL, respectively.
Here is a customized plug-n-play PHP script for reporting 404 errors via email. No editing required, just clean email alerts for each 404 error.
For WordPress users there are at least three great plugins that make maintenance mode just dead-simple. Even so, here is how to do it with .htaccess.
Quick .htaccess snippet to disable browser caching by modifying Cache-Control, Pragma, and Expires headers. Strictly plug-n-play.
An important aspect of website security is protecting sensitive data such as your server statistics. Here is an important security tip for Plesk users.
Here are two simple techniques to fade in page content with jQuery. The fade-in effect isn’t for everyone, but it’s a nice tool to have in the box.
During development there may be situations where you want to prevent WordPress from making URL requests to external websites. Here is a simple way to disable external URL requests during development.
Here is a quick cheat-sheet for redirecting URLs with .htaccess.
Micro Tip for the day: slice of PHP code for viewing all WordPress query variables. Very useful for figuring out custom loops and such.