Issue
The site throws error 503, or just a blank page with opcache extension enabled.
Environment
CloudLinux OS 6(h)/7(h)/8
cPanel/Plesk/DirectAdmin/No panel
Solution
In some rare cases, you can try to add the next parameter to opcache.ini:
opcache.optimization_level=0
The opcache optimizer is not working very well in some cases, and PHP just crashes when opcache tries to optimize it. With opcache.optimization_level set to 0, it will just cache the content, no optimizations will be made.
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