Opcache导致php-fpm崩溃nginx返回502_PHP
我这个博客为了提高运行效率在vps上装了opcache扩展，结果发现有个页面返回502，其他页面正常。
检查了php-fpm日志，发现是php-fpm子进程不知道为什么会崩溃，然后把opcache关了就正常。中间折腾的过程就不提了，总之最后发现应该是和另外一个扩展 zend guard冲突导致的，搞笑的是，只要我把php.ini中[zend guard] 配置段放在[zend opcache]后面就正常了。
不想继续深究了，如果你对php底层熟悉，可以为我解惑。
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