【背景】
折腾：
【已解决】PHP代码尝试使用vsprintf期间出错无任何输出
期间，需要搞懂，对于服务器上面运行的PHP代码，期间的log输出到哪里。
想要去查看对应的log，找到代码无法运行的原因。
【折腾过程】
1.搜：
check php log
centos check php log
参考：
Where does PHP store the error log? – Stack Overflow
apache2 – Where are the Apache and PHP log files? – Ask Ubuntu
去看看：
自己此处的/var/log/下面没有apache2或apache
2.通过：
phpinfo()
去找error_log
结果得到：
error_log | no value | no value |
3.所以去设置php.ini的log日志：
【已解决】CentOS 7中PHP配置文件php.ini的放在哪个位置
4.然后去编辑php.ini，添加对应的error_log
vi /etc/php.ini
把：
; Log errors to specified file. PHP's default behavior is to leave this value ; empty. ; http://php.net/error-log ; Example: ;error_log = php_errors.log ; Log errors to syslog (Event Log on NT, not valid in Windows 95). ;error_log = syslog
改为：
; Log errors to specified file. PHP's default behavior is to leave this value ; empty. ; http://php.net/error-log ; Example: error_log = /var/log/php_errors.log ; Log errors to syslog (Event Log on NT, not valid in Windows 95). ;error_log = syslog
5.同时把：
; error_reporting ; Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED ; Development Value: E_ALL ; Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT ...... ; and forward compatibility of your code ; E_CORE_ERROR - fatal errors that occur during PHP's initial startup ; E_CORE_WARNING - warnings (non-fatal errors) that occur during PHP's ; initial startup ; E_COMPILE_ERROR - fatal compile-time errors ; E_COMPILE_WARNING - compile-time warnings (non-fatal errors) ; E_USER_ERROR - user-generated error message ; E_USER_WARNING - user-generated warning message ; E_USER_NOTICE - user-generated notice message ; E_DEPRECATED - warn about code that will not work in future versions ; of PHP ; E_USER_DEPRECATED - user-generated deprecation warnings ; ; Common Values: ; E_ALL (Show all errors, warnings and notices including coding standards.) ; E_ALL & ~E_NOTICE (Show all errors, except for notices) ; E_ALL & ~E_NOTICE & ~E_STRICT (Show all errors, except for notices and coding standards warnings.) ; E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR (Show only errors) ; Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED ; Development Value: E_ALL ; Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT ; http://php.net/error-reporting error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
改为：
#error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT error_reporting = E_ALL | E_STRICT
6.再去添加读写权限：
root@chantyou:log# pwd /var/log root@chantyou:log# touch /var/log/php_errors.log root@chantyou:log# ls /var/log/php_errors.log -l -rw-r--r-- 1 root root 0 Jul 28 16:03 /var/log/php_errors.log root@chantyou:log# chmod +rw /var/log/php_errors.log root@chantyou:log# ls /var/log/php_errors.log -l -rw-r--r-- 1 root root 0 Jul 28 16:03 /var/log/php_errors.log root@chantyou:log#
此处由于都是root用户，所以和没添加一样。。。
7.然后重启apache2：
root@chantyou:log# service httpd restart
Redirecting to /bin/systemctl restart httpd.service
root@chantyou:log# service httpd status
Redirecting to /bin/systemctl status httpd.service
httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled)
Active: active (running) since Tue 2015-07-28 16:05:13 CST; 7s ago
Process: 6858 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
Process: 2224 ExecReload=/usr/sbin/httpd $OPTIONS -k graceful (code=exited, status=0/SUCCESS)
Main PID: 6864 (httpd)
Status: "Processing requests..."
CGroup: /system.slice/httpd.service
├─6864 /usr/sbin/httpd -DFOREGROUND
├─6866 /usr/sbin/httpd -DFOREGROUND
├─6867 /usr/sbin/httpd -DFOREGROUND
├─6868 /usr/sbin/httpd -DFOREGROUND
├─6869 /usr/sbin/httpd -DFOREGROUND
└─6870 /usr/sbin/httpd -DFOREGROUND
Jul 28 16:05:13 chantyou.com httpd[6864]: AH00548: NameVirtualHost has no effect and will be removed in the next release /e...conf:1
Jul 28 16:05:13 chantyou.com httpd[6864]: AH00558: httpd: Could not reliably determine the server's fully qualified domain ...essage
Jul 28 16:05:13 chantyou.com systemd[1]: Started The Apache HTTP Server.
Hint: Some lines were ellipsized, use -l to show in full.
root@chantyou:log# 8.看看有无log输出了：
root@chantyou:log# tail /var/log/php_errors.log root@chantyou:log#
结果空的。
那就继续去测试其他php，如果出错了，希望此处可以看到错误的log日志。
9.然后，也确定了phpinfo()中是可以看到有错误日志的配置了：
error_log | /var/log/php_errors.log | /var/log/php_errors.log |
【总结】
暂时反正是设置了PHP的错误日志，但是实际上后续的一些错误，比如代码的语法错误，结果却没有任何输出。
感觉可能还是某些地方禁止了错误输出。
估计是那个：
display_errors
？
暂不确定。
暂不去深究了。
转载请注明：在路上 » 【基本解决】CentOS 7中查看PHP运行时的Log文件日志信息