在PHP中所有的报错信息可以用error_reporting()这个函数来设置:
它的参数有字符串和数字两种表示方法,共14个等级,但是呢,我看使用其他数字貌似也可以,起初我以为它指的是一定的报错区间,后来,终于发现了其中的规律:
复制代码 代码如下:
error_reporting( 7 ) = error_reporting( 1+2+4)= error_reporting(E_ERROR | E_WARING | E_PARSE)
现在,我将其总结如下:
数字 | 常量 | 说明 |
1 | E_ERROR | 致命错误,脚本执行中断,就是脚本中有不可识别的东西出现 举例: Error:Invalid parameters. Invalid parameter name |
2 | E_WARNING | 部分代码出错,但不影响整体运行 举例: Warning: require_once(E:/include/config_base.php) |
4 | E_PARSE | 字符、变量或结束的地方写规范有误 举例: Parse error: syntax error, unexpected $end in |
8 | E_NOTICE | 一般通知,如变量未定义等 举例: Notice: Undefined variable: p in E:\web\index.php on line 17 |
16 | E_CORE_ERROR | PHP进程在启动时,发生了致命性错误 举例: 暂无 |
32 | E_CORE_WARNING | 在PHP启动时警告(非致命性错误) 举例: 暂无 |
64 | E_COMPILE_ERROR | 编译时致命性错误 举例: 暂无 |
128 | E_COMPILE_WARNING | 编译时警告级错误 举例: 暂无 |
256 | E_USER_ERROR | 用户自定义的错误消息 举例: 暂无 |
512 | E_USER_WARNING | 用户自定义的警告消息 举例: 暂无 |
1024 | E_USER_NOTICE | 用户自定义的提醒消息 举例: 暂无 |
2047 | E_ALL | 以上所有的报错信息,但不包括E_STRICT的报错信息 举例: 暂无 |
2048 | E_STRICT | 编码标准化警告,允许PHP建议如何修改代码以确保最佳的互操作性向前兼容性。 |
error_reporting 变量的默认值是 E_ALL & ~E_NOTICE
开发时,最佳的值为: E_ALL | E_STRICT
如果设置为:error_reporting(E_ALL | E_STRICT),则表示记录所有的错误信息
可能会导致网站出现一大堆的错误代码;但是对于程序员来说应该说是一件好事,可以把代码优化到最优; 一些非致命性错误虽然不影响程序的运行,但是会加重PHP的负担.
最后,晒出英文版的对照表:
1 | E_ERROR | Fatal run-time errors. Errors that can not be recovered from. Execution of the script is halted |
2 | E_WARNING | Non-fatal run-time errors. Execution of the script is not halted |
4 | E_PARSE | Compile-time parse errors. Parse errors should only be generated by the parser |
8 | E_NOTICE | Run-time notices. The script found something that might be an error, but could also happen when running a script normally |
16 | E_CORE_ERROR | Fatal errors at PHP startup. This is like an E_ERROR in the PHP core |
32 | E_CORE_WARNING | Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core |
64 | E_COMPILE_ERROR | Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine |
128 | E_COMPILE_WARNING | Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine |
256 | E_USER_ERROR | Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error() |
512 | E_USER_WARNING | Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error() |
1024 | E_USER_NOTICE | User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error() |
2048 | E_STRICT | Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code |
4096 | E_RECOVERABLE_ERROR | Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler()) |
8191 | E_ALL | All errors and warnings, except level E_STRICT (E_STRICT will be part of E_ALL as of PHP 6.0) |
error_reporting()
在php中有四种类型的错误和警告。它们是:
通常函数错误:1
通常警告:2
分析错误:4
注释(警告用户,可以忽略该信息,但是这个问题可能给您的代码会带来一些错误):8
信息后面的四个数字是该信息类型的表示值,把它们加起来作为错误报告的级别。却省的报告级别是7(即1+2+4),或除了“注释”的其他组合。这个级别能够通过改变php3.ini文件中错误报告指示的方法来改变。它也可以在用户的httpd.conf文件中改变php3错误报告的方法来设置,或者在运行的时候使用脚本语言函数error_reporting()来改变
不让PHP报告有错语发生。如果不关闭好有类似这样的错语
Warning: preg_match()
关闭就不出现了
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