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 [...]

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 [...]

More and more internet traffic is generated by the iPhone and iPod touch.
The PHP snippet below shows you how to automatically redirect your users to a page which is optimized for the iPhone Safari browser.

if(strstr($_SERVER['HTTP_USER_AGENT'],’iPhone’) || strstr($_SERVER['HTTP_USER_AGENT'],’iPod’))
{
// Change your URL below
header(‘Location: http://www.domain.com/iphone’);
exit();
}

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
*/
function loadurl(dest) {
try {
// [...]