PHP

The Gunning-Fog Index is a measure of text readability based upon sentence length and difficult words in a passage.

A tool to help automatically fix most common (X)HTML errors before outputting a page to the user.

High-traffic sites can often benefit from caching of pages, to save processing of the same data over and over again. This caching tutorial runs through the basics of file caching in PHP.

Ternary conditionals can save a lot of time and space in PHP, but can be daunting. This article is a simple guide to what they are and how they work.

How to validate email addresses according to ISO standards with PHP.

Learn how to send compressed data from PHP with htaccess.

An introduction to PHP, one of the most popular programming languages on the web.

VBScript's DateDiff function is a powerful way to express differences between dates, and PHP lacks a similar function. Here's a replica of VBScript's DateDiff function in PHP.

Much is made of techniques like Fahrner Image Replacement as ways to improve accessibility and indexing by the search engine spiders, while allowing standards compliance and graphical sites, but they do have flaws. Here's another option, in PHP.

Session hijacking is a problem on the web, not least because it can often happen by complete accident when a user cuts and pastes a URL. While it can be prevented by allowing session IDs to be held only in cookies, simply connecting session IDs with the IP address of the user can make session hijacking much harder and much less likely to happen by accident.