internal server error and 503 permissions

Hi guys.
I’m having a problem with permissions and I think it may be due to the php version I’ve installed on the server.
Emails give an error forbidden 503 and so do the websites and also if I try and view websites through account and ip address I get an internal server error 500.
Just before these errors occurred the server was working fine and then httpd service failed. As I was unable to restart the service I used yum to reinstall and start the service. I then took the opportunity to upgrade the server php version from 5.3 to 7.0 and it seems that that has caused the problems I have now.
In a bid to sort that problem out I reverted back to php version 5.3 by rebuilding the selector and then restarting the httpd service. The problem continued.
Looking in Apache2 error log I see the following:

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[Wed Nov 08 14:04:41.081278 2017] [:error] [pid 27686:tid 140447787747072] [client 46.229.168.66:11298] Failed loading /usr/local/php56/lib/php/extensions/ZendOptimizer.so:  /usr/local/php56/lib/php/extensions/ZendOptimizer.so: cannot open shared object file: No such file or directory300mb of log saying the same two errors.
So I rebuilt php 5.3 from selector and included ioncube and zen in the build. I then ran the following command

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sh /scripts/update_ioncuberestarted httpd services and the problem is still there.
Any ideas please.

you need to remove zend from your php include files since it works only with php 5.

simply check where its included and remove that line

Thank you so much studio4host.
I found an entry in the php.ini of one of the websites i was hosting and removed the entry. Not only did it stop the log file filling up it also fixed the internal server error.