Celebrating 20 years online :)
Web Dev + WordPress + Security
Category: PHP
126 posts

Blackhole for Bad Bots – Quick Start

Welcome to the Quick Start Guide for the standalone PHP version of Blackhole for Bad Bots. This post basically is a condensed summary of the original Blackhole tutorial. So if you are new to the concept of blocking bad bots, check out the original tutorial. Otherwise, for those that are familiar, the following guide should simplify things and help you get started with Blackhole as quickly as possible. Continue reading »

How to Redirect URLs

Want to redirect a URL from one location to another? This simple guide shows you how to do it with Apache/.htaccess, PHP, JavaScript, HTML, and more. Each redirect technique is briefly explained and includes ready-to-go, copy-&-paste examples. Just grab the code you need and use it in good health. May the redirects be with you! Continue reading »

Detect Attacks with PHP and .htaccess

This tutorial explains how to detect and block security threats via .htaccess, and then pass that information to a PHP script for further processing. This is a powerful technique that combines the power of Apache with the flexibility of PHP. Enabling you to do things like log all unwanted traffic, send email reports for blocked requests, create a UI to display logged data, and just about anything else you can imagine. It’s an excellent way to keep a close eye […] Continue reading »

Block Proxy Visits with PHP

I wrote recently about how to block proxy visits with WordPress. That article provides a simple, plug-&-play script that you can drop into WordPress-powered site. This article goes further with two effective techniques for blocking proxy visits to your site using only a few lines of PHP. These techniques work for any PHP-enabled site, including WordPress, Drupal, Joomla, and many others. And they’re both easy to implement. Just a few minutes and your site can be relatively free of most […] Continue reading »

Get Random with PHP

This tutorial explains numerous ways to get random items via PHP: numbers, strings, passwords, nonces, images, and more. I use these techniques in various projects, and want to round them all up in one place for easy reference. I’ll be updating this post with additional techniques as I get them. Continue reading »

WordPress Block Proxy Visits

I’ve covered a lot of techniques for controlling proxy access. And I’m not done yet. This post expands on the block tough proxies technique by making it plug-&-play with WordPress. Continue reading »

Stop User Enumeration in WordPress

This tutorial explains how to block user-enumeration scans in WordPress. As explained in greater depth here, user enumeration happens when some malicious script scans a WordPress site for user data by requesting numerical user IDs. For example, requests for author=1 through some number, say, author=1000, may reveal the usernames for all associated users. With a simple enumeration script, an attacker can scan your site and obtain a list of login names in a matter of seconds. Continue reading »

WordPress Performance Issue Revisited

Following up on my recent performance report with essentially some conclusive results. Turns out that the reported issue is related more directly to the version of PHP than to the version of WordPress. So in other words, WordPress runs a bit faster on newer versions of PHP. As explained previously, after I upgraded my sites to WordPress 4.4, Googlebot reported slightly longer load times for my pages. The slower loading average was seen across numerous sites, and it looked like […] Continue reading »

WordPress Performance Issue?

Just wanted to share a mysterious trend reported for my sites by Google Webmaster Tools, and ask if anyone else is seeing the same pattern. It looks like it’s related to the WordPress 4.4 update, but I’m not 100% sure, so putting the data out there in hopes that others can help shed some light on the issue.. Continue reading »

Protect Against WordPress Brute Force Amplification Attack

It seems the WordPress xmlrpc.php file is the target of another type of attack. Before, it was the XML-RPC Pingback Vulnerability. Now, it is the Brute Force Amplification Attack. This post explains what you need to know and then cuts to the chase with several ways to protect your site against this new malicious exploit, as well as all other related threats. Continue reading »

WordPress Enable PHP Strict Error Reporting

When developing WordPress themes and plugins, I like to enable PHP’s strict error reporting. That way all errors and notices can be recognized and dealt with accordingly. Plus, enabling PHP strict error reporting is pretty easy to do using a simple must-use plugin. Here’s how to do it.. Continue reading »

Update: Ajax Error Log – Version 2.0

Another update! This time to the vanilla/PHP version of my Ajax Error Log. As with the new WordPress version, this update improves the script’s design, performance, and security. Continue reading »

Encoding & Decoding PHP Code

There are many ways to encode and decode PHP code. From the perspective of site security, there are three PHP functions — str_rot13(), base64_encode(), and gzinflate — that are frequently used to obfuscate malicious strings of PHP code. For those involved in the securing of websites, understanding how these functions are used to encode and decode encrypted chunks of PHP data is critical to accurate monitoring and expedient attack recovery. Continue reading »

Roll Your Own “What’s My IP Address?” Page

My current ISP likes to keeps things spicy by changing my IP address every few months or so. There are a million ways to get this changing IP information, but as an obsessive web developer, I like to roll my own whenever possible. That means using my own resources instead of spending time and energy elsewhere. So the goal for this project is to create a web page that does one thing very well: display the visitor’s current IP information. […] Continue reading »

Huge Collection of Code Snippets: HTAccess, PHP, WordPress, jQuery, HTML, CSS

Please excuse this self-serving, miscellaneous post, but I’ve just got to purge all of these code snippets and scraps collected over the years. Whenever I update this site, I place any removed/unused code snippets into a giant note file for future reference, just in case. There’s all sorts of different types of code and snippets that just keep growing and growing and.. and finally it gets to a point where I just need to dump everything and start fresh. Welcome […] Continue reading »

Block Tough Proxies

If you want to block tough proxies like hidemyass.com, my previously posted .htaccess methods won’t work. Those methods will block quite a bit of proxy visits to your site, but won’t work on the stealthier proxies. Fortunately, we can use a bit of PHP to keep them out. Continue reading »

Welcome
Perishable Press is operated by Jeff Starr, a professional web developer and book author with two decades of experience. Here you will find posts about web development, WordPress, security, and more »
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