Error Messages after server database upgrade

I’m using Maria 10.5, so it’s not an issue with 10.3, probably.

It apppears you’ve enabled PHP warnings, so that might be the issue. In wp-config.php, make sure the define WP_DEBUG is set to false.

Thanks. Last I checked WP_DEBUG was set to false. But I will check again.

It seems like the highest number of warning messages originate here:

Deprecated: Function wpdb::escape is deprecated since version 3.6.0! Use wpdb::prepare() or esc_sql() instead. in /home/ssnet/public_html/wp-includes/functions.php on line 5401

I have no idea what to do about that. Is it a WordPress issue, or could it be a theme issue?

Well, you were right about the DEBUG setting. Thank you!
I now set it to “false” and the relevant portion of the file now reads

define (‘WPLANG’, ”);
define (‘WP_DEBUG’, ‘false’);
// ** Multi-site settings ** //

However, I’m still getting this error:<blockquotDeprecated: Function wpdb::escape is deprecated since version 3.6.0! Use wpdb::prepare() or esc_sql() instead. in /home/ssnet/public_html/wp-includes/functions.php on line 5401

• This reply was modified 2 years, 2 months ago by inge12.

After submitting a comment on a post (with DEBUG set to “false”), I get this list of error messages, which have to be intimidating for our users!

`Deprecated: Function wpdb::escape is deprecated since version 3.6.0! Use wpdb::prepare() or esc_sql() instead. in /home/ssnet/public_html/wp-includes/functions.php on line 5401

Warning: Cannot modify header information – headers already sent by (output started at /home/ssnet/public_html/wp-includes/functions.php:5401) in /home/ssnet/public_html/wp-includes/comment.php on line 569

Warning: Cannot modify header information – headers already sent by (output started at /home/ssnet/public_html/wp-includes/functions.php:5401) in /home/ssnet/public_html/wp-includes/comment.php on line 570

Warning: Cannot modify header information – headers already sent by (output started at /home/ssnet/public_html/wp-includes/functions.php:5401) in /home/ssnet/public_html/wp-includes/comment.php on line 571

Warning: Cannot modify header information – headers already sent by (output started at /home/ssnet/public_html/wp-includes/functions.php:5401) in /home/ssnet/public_html/wp-content/plugins/litespeed-cache/src/vary.cls.php on line 729

Warning: Cannot modify header information – headers already sent by (output started at /home/ssnet/public_html/wp-includes/functions.php:5401) in /home/ssnet/public_html/wp-includes/pluggable.php on line 1421

Warning: Cannot modify header information – headers already sent by (output started at /home/ssnet/public_html/wp-includes/functions.php:5401) in /home/ssnet/public_html/wp-includes/pluggable.php on line 1424`

You have an error in your wp-config.php file. You currently have this:

define ('WP_DEBUG', 'false');

Change it to this:

define('WP_DEBUG', false);

and the messages should be suppressed.

Please be aware that this will only suppress the deprecated and resulting warning messages; it will not resolve the issue. It appears that you have some very old (or very poorly written) code in either your theme or in one of your active plugins, and given the nature of the deprecated function, the code is potentially unsafe. If your theme and all your plugins are up-to-date, then you shouild consider deactivating your plugins to determine whether one of them is the culprit. If the issue persists after deactivating all your plugins, then your theme is the likely culprit, and you might want to contact the theme’s author for support.

Thank you for this! It helps me to know how to move forward.

Thanks again

LOL! I was trying to mark this as “Resolved.” Maybe this time it will “take.”