Here’s a list of the developer-oriented plugins for WordPress that I use on a regular basis. (Alternative title: 9 WordPress Plugins You Can’t Live Without. You’ll Never Believe What Number 4 Does!) Invaluable if you’re working with rewrite rules. Not only lists all the current rewrite rules on your site, but also lets you query a URL to see which rules it matches. This plugin is an under-appreciated gem. It lets you specify simple tests for your rewrite rules to avoid problems such as missing or clashing rules. Just give it an array of paths and the expected corresponding query for each, and the plugin will let you know if any of them fail. Query Monitor My own plugin which provides debugging and performance information on database queries, hooks, conditionals, HTTP requests, redirects, scripts & styles, transients, and lots more. A modern-day replacement for Debug Bar. Deprecated notices in WordPress can slip by, especially if they’re happening some place that you don’t look. This plugin logs these notices and provides a simple admin list screen with the call count and information about the alternative function or function arguments. Pig Latin and RTL Tester Combined, these plugins
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