Deprecation Checker simply scans your plugins, themes, and custom directories for deprecated functions.
As of April 2026, Deprecation Checker is a WordPress debug plugin with 20 active installations and a 5/5 rating from 2 reviews. It has been downloaded 3.4K+ times in total. Requires WordPress 3.3+ and PHP false+. Available on WordPress.org since 2012. Last updated 14 years ago — may have compatibility concerns. Top alternative: WP Crontrol.
WP_DEBUG works well, however is not inclusive of all theme/plugin files that might not be loaded during certain page loads. Deprecation Checker allows you to view all the deprecated functions complete with path, line number, deprecation function name, and the new recommended function to use.
Deprecated files are collated directly from WordPress core itself, so this plugin is scalable with future versions of WordPress.
We’ve included a couple handy filters and constants to make this plugin flexible for your own needs:
| WordPress | 3.3+ requiredTested up to 3.3.2 |
| PHP | false+ required |
If you have a feature request or question, please use the Deprecation Checker support forum.
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.