发现php 运行错误时，浏览器的网页上并没有输出php的错误日志。那php的错误日志在哪里呢？ 发现在 /var/log/nginx/error.log文件中。
怎么样才能在浏览器的网页中输出php的出错信息呢？
编辑 /etc/php5/fpm/php.ini文件，将display_errors = On. (如果不改php.ini文件，只是在执行文件中 ini_set("display_errors", "on"))发现没效果，不知道为什么呢？奇怪！！
这样改了php.ini文件后，网页上就可以看到php的出错信息了，便于调试。
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I gathered insights from a bunch of answers here and I present a comprehensive solution:
So, if you setup nginx with php5-fpm and log a message using error_log() you can see it in /var/log/nginx/error.log by default.
A problem can arise if you want to log a lot of data (say an array) using error_log(print_r($myArr, true));. If an array is large enough, it seems that nginx will truncate your log entry.
To get around this you can configure fpm to manage logs. Here are the steps to do so.
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Open /etc/php5/fpm/pool.d/www.conf:
$ sudo nano /etc/php5/fpm/pool.d/www.conf
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Uncomment the following two lines by removing ; at the beginning of the line:
;php_admin_value[error_log] = /var/log/fpm-php.www.log ;php_admin_flag[log_errors] = on
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Create /var/log/fpm-php.www.log:
$ sudo touch /var/log/fpm-php.www.log;
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Change ownership of /var/log/fpm-php.www.log so that php5-fpm can edit it:
$ sudo chown vagrant /var/log/fpm-php.www.log
Note: vagrant is the user that I need to give ownership to. You can see what user this should be for you by running $ ps aux | grep php.*www and looking at first column.
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Restart php5-fpm:
$ sudo service php5-fpm restart
Now your logs will be in /var/log/fpm-php.www.log.
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