配置php显示错误
默认php是不显示错误的，例如你写了
require_once('xxx.php')
但是这个文件并不存在，这样导致你的网页输出不正常，但是你又看不到这个错误，要看到这个错误，就需要打开php的错误显示。这个配置是在php的配置文件 php.ini文件中，在linux系统中，这个文件的位置是在
/etc/php.ini
打开它，找到下面的内容，
515 ; This directive controls whether or not and where PHP will output errors,
516 ; notices and warnings too. Error output is very useful during development,,
but
517 ; it could be very dangerous in production environments. Depending on the cc
ode
518 ; which is triggering the error, sensitive information could potentially lee
ak
519 ; out of your application such as database usernames and passwords or worsee
520 ; It's recommended that errors be logged on production servers rather than
521 ; having the errors sent to STDOUT.
522 ; Possible Values:
523 ; Off = Do not display any errors
524 ; stderr = Display errors to STDERR (affects only CGI/CLI binaries!)
525 ; On or stdout = Display errors to STDOUT
526 ; Default Value: On
527 ; Development Value: On
528 ; Production Value: Off
529 ; http://www.php.net/manual/en/errorfunc.configuration.php#ini.display-erroo
rs
530 display_errors = Off
看到530了吧，默认是off，我们把它的值改为 On
然后保存退出即可。
上面也提到了，在开发阶段，建议将它的值设为On，发布之后改为Off。
上面说到是怎么显示错误，其实php还有一个参数用来控制到底输出什么样的错误，这个通过
error_reporting
这个参数控制。
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Error handling and logging ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; error_reporting is a bit-field. Or each number up to get desired error ; reporting level ; E_ALL - All errors and warnings (doesn't include E_STRICT) ; E_ERROR - fatal run-time errors ; E_WARNING - run-time warnings (non-fatal errors) ; E_PARSE - compile-time parse errors ; E_NOTICE - run-time notices (these are warnings which often result ; from a bug in your code, but it's possible that it was ; intentional (e.g., using an uninitialized variable and ; relying on the fact it's automatically initialized to an ; empty string) ; E_STRICT - run-time notices, enable to have PHP suggest changes ; to your code which will ensure the best interoperability ; 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 ; ; Examples: ; ; - Show all errors, except for notices and coding standards warnings ; ;error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT ; ; - Show all errors, except for notices ; ;error_reporting = E_ALL & ~E_NOTICE ; ; - Show only errors ; ;error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR ; ; - Show all errors ; error_reporting = E_ALL
默认是输出所有的错误，可以根据自己的需求，自定义。
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