PHP Error

Thanks for the report. This error has been reported a few times but I do not know under which condition it can occur.

The db.php file only loads after wp-config.php loads, and if you don’t have those DB_ constants in place then your database connection will fail. So there should not be a path that loads this file without those constants, but maybe there is.

Can you let me know which plugins you have installed and active please? I can only assume that one of them might be doing something weird with manually loading the wp-content/db.php file.

• This reply was modified 4 years ago by John Blackbourn.

Thnx for your reply John. I dont want to post our pluginlist here. If you can send send me a private eMail adress or something like that, I will send it to you.

best regards
Nick

I’m getting the “undefined constant” issue in db.php as well. Is it preferable that I start a new thread for it or can I post the error log and seek troubleshooting in this one? Thanks.

@freshpromo an error log and list of your active plugins would be very helpful, thanks!

[Dec 03, 16:16:03] PHP Warning: Use of undefined constant DB_USER – assumed ‘DB_USER’ (this will throw an Error in a future version of PHP) in /home/mydomain/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 139
[Dec 03, 16:16:03] PHP Warning: Use of undefined constant DB_PASSWORD – assumed ‘DB_PASSWORD’ (this will throw an Error in a future version of PHP) in /home/mydomain/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 139
[Dec 03, 16:16:03] PHP Warning: Use of undefined constant DB_NAME – assumed ‘DB_NAME’ (this will throw an Error in a future version of PHP) in /home/mydomain/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 139
[Dec 03, 16:16:03] PHP Warning: Use of undefined constant DB_HOST – assumed ‘DB_HOST’ (this will throw an Error in a future version of PHP) in /home/mydomain/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 139

Active plugins:

Akismet Anti-Spam
Child Theme Configurator
Classic Editor
Disqus for WordPress
Enhanced Media Library
Error Log Monitor
External Links
Formidable Forms
Health Check & Troubleshooting
iframe
MC4WP: Mailchimp for WordPress
reCaptcha by BestWebSoft
Sucuri Security – Auditing, Malware Scanner and Hardening
Table Sorter
TablePress
Twitter
WP Force SSL
WP SEO Structured Data Schema
WPBakery Page Builder
Yoast SEO

This might be unrelated, but I noticed that there’s another db.php file in public_html/wp-content/ It’s locked but has 777 file permissions. No idea why that’s there. Is that normal?

@johnbillion ok, we have also installed the plugins

Classic Editor
TablePress
Yoast SEO

and we have also a db.php file at /wp-content/ with a 777 file permissions

@nick7766 @freshpromo Thanks for the info. I’ve been testing various plugins in your lists and haven’t seen this error occur yet.

Do you have any idea when this error appears? eg. does it appear when viewing a certain page or performing a certain action?

@johnbillion I checked the website logs. The last time I got a php warning, it happened at the same timestamp as what looks like a bot connection:

168.119.51.159 – – [14/Dec/2020:05:54:12 -0600] “GET /robots.txt HTTP/1.1” 200 69 “-” “Mozilla/5.0 (compatible; um-IC/1.0; mailto: [email protected]; Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1”
168.119.51.159 – – [14/Dec/2020:05:54:13 -0600] “GET /category/analysis/feed/ HTTP/1.1” 200 47718 “-” “Mozilla/5.0 (compatible; um-IC/1.0; mailto: [email protected]; Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1”
185.224.138.46 – – [14/Dec/2020:05:57:12 -0600] “POST /xmlrpc.php HTTP/1.1” 200 403 “-” “Mozilla/5.0 (Linux; Android 5.1.1; vivo X7 Build/LMY47V; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/48.0.2564.116 Mobile Safari/537.36 baiduboxapp/8.6.5 (Baidu; P1 5.1.1) wp-android/16.2”

But the last couple PHP warnings before this one did not coincide with any other action, so the bot connection may be meaningless.

It’s probably not Theme related either, as I’ve gotten the warnings while using multiple themes – Newspaper (Pro) and Donovan (free).

Thanks for looking into this. If you can’t solve it no worries, as it’s not a major problem for my site.

@johnbillion update: I got the warning again today, a couple hours after doing some tasks in WP.

– Logged out of my account and then back in
– Ran an SEO scan using the Yoast plugin
– In the Disqus plugin, clicked Manually Sync Comments under the Sync tab
– Moved a draft Page to the trash

Given the two hour gap between these and the warning, I’m not sure this is meaningful, but wanted to share. Cheers.

[04-Mar-2021 06:45:36 UTC] PHP Warning:  Use of undefined constant DB_USER - assumed 'DB_USER' (this will throw an Error in a future version of PHP) in /home/sakurajav/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 140
[04-Mar-2021 06:45:36 UTC] PHP Warning:  Use of undefined constant DB_PASSWORD - assumed 'DB_PASSWORD' (this will throw an Error in a future version of PHP) in /home/sakurajav/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 140
[04-Mar-2021 06:45:36 UTC] PHP Warning:  Use of undefined constant DB_NAME - assumed 'DB_NAME' (this will throw an Error in a future version of PHP) in /home/sakurajav/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 140
[04-Mar-2021 06:45:36 UTC] PHP Warning:  Use of undefined constant DB_HOST - assumed 'DB_HOST' (this will throw an Error in a future version of PHP) in /home/sakurajav/public_html/wp-content/plugins/query-monitor/wp-content/db.php on line 140

My Plugin list:

All in One SEO
Disable Feeds
Fix Duplicates
Jetpack by WordPress.com
MainWP Child
Query Monitor
Remove Category URL
WP-PostRatings
WPS Hide Login

line 140 on query-monitor/wp-content/db.php:

$wpdb = new QM_DB( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );

The error says: assumed ‘DB_USER’

So, this line should have quotes on each DB_ ???

Thanks.

• This reply was modified 3 years, 9 months ago by El Tio Rufi.
• This reply was modified 3 years, 9 months ago by El Tio Rufi.