Intermittent PHP Abstract Class Error

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I think you’ve run into this opcache bug. This isn’t exactly the same situation but probably related.

After calling opcache_reset() function we encounter some weird errors.
It happens randomly on servers (10 of 400 servers production)

Some letter a replaced by others, Class seems to be already declared..
etc

Example of errors triggered after opcache_reset():

  • PHP Fatal error: Class XXX contains 1 abstract method and must therefore be declared abstract or implement the remaining methods
    (YYY::funczzz) in /dir/dir/x.php on line 20

The ticket is closed because the developers don’t have enough information to reproduce it. If you could come up with the smallest reproducible case I recommend reporting it. Create a very small Slim app and then use JMeter or another tool to make many requests. Post your findings.

Meanwhile the only workaround might be to turn off opcache in php.ini:

opcache.enable=0

Of course this will drastically hurt performance. Until it’s fixed you’ll have to choose between performance or periodically restarting Apache.

If turning the cache off doesn’t work then the only cause I could think of is an intermittent problem with the opcode compiler. Cached or not the compiled version must have an error in it. Opening a reproducible ticket with the PHP devs or debugging the PHP source yourself would be the only way forward if this is the cause.

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