nginx php error log 配置 查找500 错误

nginx与apache不一样，在apache中可以直接指定php的错误日志，那样在php执行中的错误信息就直接输入到php的错误日志中，可以方便查询。
在nginx中，nginx只对页面的访问做access记录日志。不会有php的error log 信息。nginx把对php的请求发给php-fpm fastcgi进程来处理，默认的php-fpm只会输出php-fpm的错误信息，在php-fpm的errors log里也看不到php的errorlog。
原因是php-fpm的配置文件php-fpm.conf中默认是关闭worker进程的错误输出，直接把他们重定向到/dev/null,所以我们在nginx的error log 和php-fpm的errorlog都看不到php的错误日志。

所以我们要进行如下的设置就能查看到nginx下php-fpm不记录php错误日志的方法：

1，修改

php-fpm.conf

error_log = /alidata/log/php/php-fpm.log

catch_workers_output = yes

2，修改 php.ini

log_errors = On

3,重启php-fpm

service php-fpm restart

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出错信息

当调用webji的php webservicd 接口时候报错 

1，只是在页面上看到500的错误，

2，在nginx的 access log 中能看到 500 返回码

58.247.1.218 - - [15/Aug/2016:16:05:35 +0800] "GET /?route=user/user/pay_problem HTTP/1.1" 500 112 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/600.1.3 (KHTML, like Gecko) Version/8.0 Mobile/12A4345d Safari/600.1.4"

3，而在nginx的error log中 无任何输出

所以必须先把error log呈现出来，通过上面配置

监听 /alidata/log/php/php-fpm.log，得到如下log

[16-Aug-2016 09:59:06] WARNING: [pool www] child 12539 said into stderr: "NOTICE: PHP message: PHP Warning:  fopen(/alidata/www/jx_financial/system/logs/error.log): failed to open stream: Permission denied in /alidata/www/jx_financial/system/library/log.php on line 6"
[16-Aug-2016 09:59:06] WARNING: [pool www] child 12539 said into stderr: "NOTICE: PHP message: PHP Warning:  fwrite() expects parameter 1 to be resource, boolean given in /alidata/www/jx_financial/system/library/log.php on line 10"
[16-Aug-2016 09:59:06] WARNING: [pool www] child 12539 said into stderr: "NOTICE: PHP message: PHP Warning:  fwrite() expects parameter 1 to be resource, boolean given in /alidata/www/jx_financial/system/library/log.php on line 10"
[16-Aug-2016 09:59:06] WARNING: [pool www] child 12539 said into stderr: "NOTICE: PHP message: PHP Warning:  fwrite() expects parameter 1 to be resource, boolean given in /alidata/www/jx_financial/system/library/log.php on line 10"
[16-Aug-2016 09:59:06] WARNING: [pool www] child 12539 said into stderr: "NOTICE: PHP message: PHP Warning:  fwrite() expects parameter 1 to be resource, boolean given in /alidata/www/jx_financial/system/library/log.php on line 10"
[16-Aug-2016 09:59:06] WARNING: [pool www] child 12539 said into stderr: "NOTICE: PHP message: PHP Fatal error:  Call to a member function get() on a non-object in /alidata/www/jx_financial/index.php on line 114"

至此，知道是文件权限问题，

chown www:www system -R

问题解决