【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：
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; 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：
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; 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：
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; 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
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改为：
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#error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
error_reporting = E_ALL | E_STRICT
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6.再去添加读写权限：
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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：
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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
#
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8.看看有无log输出了：
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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。