php常见错误
1. kevent() reported that connect() failed (61: Connection refused) while connecting to upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "127.0.0.1"原因：php-fpm没启动，不能把请求解析到php文件。
解决方法：
启动php-fpm，在终端运行命令： sudo php-fpm
2. FastCGI sent in stderr: "PHP message: PHP Warning: Unknown: open(/var/tmp//sess_bbdipplspnn6ee7tkj1ce03oj3, O_RDWR) failed: Permission denied (13) in Unknown on line 0
原因： php的session.save_path没设置
解决方法： 设置一下php.ini中的session.save_path，并且赋予nginx访问权限
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