Opcache causes php-fpm to crash nginx returns 502_PHP Tutorial

Opcache causes php-fpm to crash nginx returns 502

This article mainly introduces the solution to Opcache causing php-fpm to crash nginx returns 502. It is very practical. Friends who need it can For reference

In order to improve the operating efficiency of my blog, I installed the opcache extension on the vps. As a result, I found that one page returned 502, and other pages were normal.

I checked the php-fpm log and found that the php-fpm sub-process crashed for no reason. Then I turned off opcache and everything was normal. I won’t mention the tossing process in the middle. In short, I finally found out that it should be caused by a conflict with another extension, zend guard. The funny thing is, as long as I put the [zend guard] configuration section in php.ini after [zend opcache], it will be normal. .

I don’t want to go into details anymore. If you are familiar with the bottom layer of php, you can help me answer my questions.

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