Content Types Overview Screen
Adds Tools > Content Types, a table of every registered post type and taxonomy with its labels, visibility, archive, REST base, URL slug and item count.
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Daily Email Summary of New PHP Errors
Reads new lines in debug.log once a day and emails a short summary of fatal errors, warnings and notices with how often each occurred, so problems do not go unnoticed.
Duplicate Database Queries Report for Administrators
Add ?wpide_queries=1 to any page while logged in as an administrator to see, at the bottom of the page, the queries that ran more than once and the ten slowest queries, with the code that called them.
Email Log Under Tools
Keeps a list of the last 100 emails the site tried to send (date, recipient, subject and whether it failed) and shows it under Tools > Email Log.
Find What Is Calling admin-ajax.php
Counts admin-ajax.php requests per action (and whether they come from the front end or the dashboard) for the current day and the previous six, and shows the busiest ones under Tools > AJAX Usage.
Inspect the Main Query and Its SQL
Lets administrators add ?wpide_query=1 to a front-end URL to print the main query's variables, the SQL it ran and the number of posts found at the bottom of the page.
Keep Plugin Deprecation Notices Out of debug.log
Stops PHP deprecation notices coming from plugins and themes from filling debug.log, so the real warnings and errors you are looking for stand out while debugging.
List All Registered Shortcodes Under Tools
Adds a Tools > Shortcodes screen listing every shortcode available on the site and the plugin, theme or function that provides it, so you know what can be used in content.
List Enqueued Scripts and Styles in the Page Source
Prints an HTML comment at the bottom of each page, visible to administrators, listing every script and stylesheet handle loaded and its source, to find what to optimize.
List Every Database Query on a Page for Administrators
When SAVEQUERIES is enabled, lets administrators add ?wpide_queries=1 to a front-end URL to see every SQL query of the page with its time and calling function, slowest first.
List Every Hook Fired on a Page
Lets administrators add ?wpide_hooks=1 to any front-end URL to see, at the bottom of the page, every action and filter that ran and how many times, in firing order.
Log Deprecated and "Doing It Wrong" Notices With Their Source
Writes every deprecated function, argument, hook or "doing it wrong" notice to the PHP error log with the plugin or theme file that caused it, even when WP_DEBUG is off.
Log Every Email to Daily Files With Rotation
Writes one line per outgoing email (time, recipient, subject, result) to a daily log file in a protected uploads folder, and deletes files older than the number of days you choose.
Log Every Redirect With Its Source
Writes each redirect WordPress makes to the error log, including the target, status code and the file that triggered it, to track down redirect loops.
Log Failed Emails
Writes a line to the PHP error log whenever wp_mail() fails, with the subject, recipients and error message, to help debug delivery problems.
Log Scheduled Tasks That Take Too Long
Measures how long each scheduled task (cron event) takes to run and records the slow ones under Tools > Slow Cron Tasks, so you can spot the plugin that makes WP-Cron sluggish.
Log Slow Page Loads
Writes a line to the PHP error log for every request that takes longer than a set number of seconds, with the URL, time, memory and query count.
Mark Each Block in the Page Source for Administrators
Wraps every rendered block in HTML comments with its name, such as core/group or a plugin's block, when an administrator views a page with ?wpide_blocks=1, to see which block produced which markup.
PHP Info Screen for Administrators
Adds a Tools > PHP Info screen showing the full phpinfo() report (extensions, limits, configuration), handy when a host's control panel does not show it.
Page Weight Summary in the Admin Bar
Shows an admin bar item on the front of the site with the total size of the page's scripts, stylesheets, images and fonts, and a breakdown with the heaviest files when you click it.
Private Log File Helper Function
Adds a wpide_log() helper that writes timestamped messages and data to a daily log file in a protected folder inside uploads, so custom code can leave a trail without touching debug.log.
Query Count and Load Time in the Page Source
Adds an HTML comment at the bottom of front-end and admin pages with the number of database queries, generation time and peak memory. Visible to administrators only.
REST API Error Log Under Tools
Records REST API requests that fail with a 4xx or 5xx status, with the route, method, user and error code, and lists the latest 100 under Tools > REST Errors for debugging integrations.
Read-Only Custom Fields Viewer for Administrators
Adds a box to the post editor that lists every custom field stored for the post, hidden ones included, with serialized arrays and JSON shown in a readable layout. Nothing can be changed from it.