Site DOwn after 4.9.2 Upgrade

Hi @mjb566.,

Error Related to Missing or Damaged Core Files
Try downloading WordPress again, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel, and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings.
Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.

Thanks
Rajan V

Is your domain is correct?

Hi Rajan,
Apologies, domain incorrect and should be https://www.hampshirechess.co.uk/
Thanks for your help, I will try 4.9.2 upload via ftp.

@mjb566

I can’t find the issue on your site. May i know your site current wp version

Thanks
Rajan V

Hi Rajan,
The version is 4.9.2 but I have replaced wp-db.php with the version from 4.9.1, if I upload the new version of wp-db.php then the site crashes.

Hi,
I have uploaded all of the new files from 4.9.2 with the exception of the config.php and wp-content folder files. Still the error persists until I remove the new wp-db.php file.

Any new ideas would be appreciated, thanks.

Hi,
I have deactivated all plugins but with 4.9.2 am still getting the error message – Warning: preg_match(): Compilation failed: unrecognized character after (?< at offset 4 in /web1/user/website/wp-includes/wp-db.php on line 1657

You have done this step?

Try downloading WordPress again, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel, and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings.
Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.

Hi Rajan,
Thanks for coming back ?? I tried the complete re-install option as described an hour ago, unfortunately, it made no difference. I will try it again. I have also changed themes but that made no difference either.

OOPS Site give 403 Error. Are you working on this?

Hi Rajan,
I have just now deleted and re-installed a fresh 4.9.2 less the config file and content folder. I have deactivated all plugins and changed the theme. I am still getting the error message – Warning: preg_match(): Compilation failed: unrecognized character after (?< at offset 4 in /web1/user/website/wp-includes/wp-db.php on line 1657

I have the same problem with website beverleymalevoicechoir.co.uk I do not have much in the way of technical skill and would not know where to start to fix this myself. Surely the error is with WP and if they have auto-updated with a dodgy version they should remedy it for all those affected? No?

@petergo1

My site is fine with wp-db.php from version 4.9.1
The error occurs as soon as wp-db.php from 4.9.2 is uploaded. Te reported error refers to an unrecognized character but there is not one in the file on or near the line reported 1657.

After reading a possibility was that the file had not been uploaded in plain UTF-8, I downloaded Notepad++ and checked the encoding but found it to be correct.

I have exactly the same theme and WordPress install working perfectly on another web-space provider so am wondering if the php version is the culprit?

My provider is using PHP 5* whereas the provider where the install works fine is using PHP 7*

I don’t know the answer at the moment.

My site – https://www.beverleymalevoicechoir.co.uk is showing just the same error message as yours – line 1657, you can see it on a strap across the top of the home page. The website is usable, except I can’t enter the members’ page or the wp/admin page. I suspect we are not alone and that there are others who have simply not tried to use their relevant pages since the night before last!

As stated, I do not have the relevant IT skills to even try to remedy the problem myself so have asked our website design company to sort it for me. I will let you know how they get on.

Peter

@rajanit2000