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Author: Jeff Starr
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Jeff Starr
Jeff Starr is a web developer, author, and teacher specializing in web security and building awesome things with WordPress. His online projects include Plugin Planet, DigWP.com, and WP-Mix.com. Jeff writes books, runs his own business, writes about web development, and makes video tutorials at Lynda.com.

2013 User Agent Blacklist

The 2013 User Agent Blacklist blocks hundreds of the worst bots while ensuring open-access for normal traffic, major search engines (Google, Bing, et al), good browsers (Chrome, Firefox, Opera, et al), and everyone else. Compared to blocking threats by IP, blocking by user-agent is more effective as a general security strategy. Although it’s trivial to […] Continue »

2013 IP Blacklist

When time allows, I like to post my collections of the worst IP addresses for the current year. Certainly, there are pros and cons to using an IP blacklist. In general, IPs are easily spoofed, change frequently, and are therefore unreliable as a general security strategy. But as a short-term solution, IP blacklists serve as […] Continue »

Cool Fractal Videos

Fractals are the best! Here are some of the best I’ve seen on YouTube. Continue »

Slowing Down Movies in Quicktime

Just a quick post today.. Awhile ago I was putting together some video screencasts, and needed a way to “slow-down” the video to play certain sections at half-speed. After much trial and fiddling, here are the steps that actually worked to produce a saved copy of the movie (not just run the slow motion effect […] Continue »

New Demos and Tools Pages

Working on organizing the site, I’ve put together two new pages that round-up my Demos and Tools. The demos are organized into sections, Ajax, CSS, PHP, and so on. Most of the tools are for encoding and decoding, but will eventually include stuff for CSS, .htaccess, JavaScript, et al. Both of these new pages are […] Continue »

List All Files and Folders Recursively via Terminal

From time to time I have occasion to generate a list all WordPress files or similar. As I’m not an expert in Terminal, it took awhile to figure out the magic recipe.. now having collected some useful commands, I want to post ‘em for future reference. Continue »

Learn the Way of WordPress

It’s been quiet around here, but I have a good excuse. I spent the last six months writing, designing, and publishing my third book, The Tao of WordPress. This is an excellent book for beginners, students, designers, and basically anyone who wants to learn how to get the most from WordPress. The book “soft-launched” last […] Continue »

New Design in Progress

My new book is doing well, so I have some time to work on my sites. Here at Perishable Press, I’ll be working on a redesign, refreshing some older content, and posting some new articles. Continue »

Set Up WordPress MultiSite on MAMP

In this tutorial, you’ll learn how to install and run WordPress MultiSite on a MAMP webserver. Running multiple sites from a single installation simplifies and streamlines administration, and serving it all from a locally installed version of MAMP gives you everything you need to develop your network of sites for the Web. Continue »

Run WordPress Locally with _AMP

To run WordPress on the Web, you need a domain name and web host. But you don’t need either of those things to run WordPress on your own computer. You need only to set up a local server environment that includes Apache, MySQL, and PHP. That may sound like a tall order, but thanks to […] Continue »

WP-Mix – A fresh mix of code snippets and tutorials

Wrapping up 2012, I finally launched xyCSS, which is all about responsive, grid-based design. To showcase xy.css, I used it to design WP-Mix.com, which also serves to house a growing collection of choice code snippets. Currently WP-Mix features over 100 snippets, tutorials, and other useful bits to help with WordPress development and web design in […] Continue »

xy.css – Responsive Grid Design

For the past year or so, I’ve been heavy into responsive, grid-based design. In December, I “soft-launched” my new site, xyCSS with a simple tweet: Bringing it all together: https://perishablepress.com/xycss/ As implied (and explained), xy.css is a lightweight CSS template for creating semantic HTML5 designs on a responsive liquid matrix. Continue »

5G Blacklist 2013

Following up on much feedback (and this post), here is an update for the 5G Blacklist for 2013. As explained in the 2012 article (and elsewhere), the 5G Blacklist helps reduce the number of malicious URL requests that hit your website. It’s one of many ways to improve the security of your site and protect […] Continue »

Introspection WordPress Theme

Free WordPress theme! The dark/minimalist design of the Introspection theme was originally created for a Pink Floyd fan site. After taking the site down to clear room (and time) for new stuff, I felt the design was too sweet to just let rot away in the archives. So after a few days of generalizing Introspection […] Continue »

Protection for WordPress Pingback Vulnerability

It was recently reported about a WordPress Pingback Vulnerability, whereby an attacker has four potential ways to cause harm via xmlrpc.php, which is the file included in WordPress for XML-RPC Support (e.g., “pingbacks”). In this post, I offer a simple .htaccess technique to lock things down and protect against any meddling via the xmlrpc.php file. Continue »

(Please) Stop Using Unsafe Characters in URLs

Just as there are specifications for designing with CSS, HTML, and JavaScript, there are specifications for working with URIs/URLs. The Internet Engineering Task Force (IETF) clearly defines these specifications in numerous documents, including the following: Continue »

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