Issues with some sites (New and Old) after migrating to Ubuntu 24.04.1 lts

Hey Guys,
Its not that often I ask for help however I have a strange problem, that googling, and reading I cannot find the answer too.
I have upgraded my little server to Ubuntu 24.04.1 ltd, using the upgrade guide. Trying to make sure I have not missed any steps..

The Issue I have is with new sites is when I create the site in ISPconfig, and add any php files, I get the following error
The following error occurred:
You have used invalid syntax.

Please contact the webmaster with any queries.

From the console PHP - v = PHP 8.3.13 (cli)
If I change the default php versions on the sites afected it does not make any change, I do have several versions installed.

ISPconfig its self seems to be working well, and other sites on the server are good too, which is why I am struggling with the actual issue. If I CLI to the server and go to the web site directory, and run php jez.php, the file runs fine.

update-alternatives --config php * 0 /usr/bin/php8.3 83 auto mode
update-alternatives --config php-cgi * 0 /usr/bin/php-cgi8.3 83 auto mode
update-alternatives --config php-fpm.sock * 0 /run/php/php8.3-fpm.sock 83 auto mode


Clearly I have either missed something, and / or screwed somthing -

When updating I did also run this command to update and install the requirements for PHP
apt -y install php8.3 php8.3-cli php8.3-cgi php8.3-fpm php8.3-gd php8.3-mysql php8.3-imap php8.3-curl php8.3-intl php8.3-pspell php8.3-sqlite3 php8.3-tidy php8.3-xsl php8.3-zip php8.3-mbstring php8.3-soap php8.3-opcache php8.3-common php8.3-readline php8.3-xml curl

Any ideas please, and I am pulling my hair out (Even though I dont have any !)

Cheers

 

Hey @till, The log file is blank ? 0 Bytes.

 

I have just checked there are no files with .err in sites-available.

 

I think I have solved it. Stipped off all PHP's and reinstalled. Will come back shortly

 

Hey Till, thank you for your help - my changes above sorted the issue..