名站导航为爱好php程序的朋友们提供php相关的教程知识。
PhP程序函数:error_reporting() 用法
error_reporting() 设置 PhP程序 的报错级别并返回当前级别。
语法:error_reporting(report_level)
如果参数 level 未指定,当前报错级别将被返回。下面几项是 level 可能的值:
; 错误报告是按位的。或者将数字加起来得到想要的错误报告等级。
; E_ALL - 所有的错误和警告
; E_ERROR - 致命性运行时错
; E_WARNING - 运行时警告(非致命性错)
; E_PARSE - 编译时解析错误
; E_NOTICE - 运行时提醒(这些经常是是你的具体代码如下的bug引起的,
;也可能是有意的行为造成的。(如:基于未初始化的变量自动初始化为一个
;空字符串的事实而使用一个未初始化的变量)
; E_CORE_ERROR - 发生于PhP程序启动时初始化过程中的致命错误
; E_CORE_WARNING - 发生于PhP程序启动时初始化过程中的警告(非致命性错)
; E_COMPILE_ERROR - 编译时致命性错
; E_COMPILE_WARNING - 编译时警告(非致命性错)
; E_USER_ERROR - 用户产生的出错消息
; E_USER_WARNING - 用户产生的警告消息
; E_USER_NOTICE - 用户产生的提醒消息
任意数目的以上选项都可以用“或”来连接(用 OR 或 |),这样可以报告所有需要的各级别错误。例如,下面的具体代码如下关闭了用户自定义的错误和警告,执行了某些操作,然后恢复到原始的报错级别:
<?php //禁用错误报告 error_reporting(0); //报告运行时错误 error_reporting(E_ERROR | E_WARNING | E_PARSE); //报告所有错误 error_reporting(E_ALL); ?>
更详细可以参照下表:
值 | 常量 | 描述 |
---|---|---|
1 | E_ERROR | Fatal run-time errors. Errors that can not be recovered from. Execution of the script is halted 致命的运行时错误 |
2 | E_WARNING | Non-fatal run-time errors. Execution of the script is not halted 运行时警告(非致命性错误) |
4 | E_PARSE | Compile-time parse errors. Parse errors should only be generated by the parser 编译时解析错误 |
8 | E_NOTICE | Run-time notices. The script found something that might be an error, but could also happen when running a script normally 运行时提醒(经常是bug,也可能是有意的) |
16 | E_CORE_ERROR | Fatal errors at PhP程序 startup. This is like an E_ERROR in the PhP程序 core PhP程序启动时初始化过程中的致命错误 |
32 | E_CORE_WARNING | Non-fatal errors at PhP程序 startup. This is like an E_WARNING in the PhP程序 core PhP程序启动时初始化过程中的警告(非致命性错) |
64 | E_COMPILE_ERROR | Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine 编译时致命性错 |
128 | E_COMPILE_WARNING | Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine 编译时警告(非致命性错) |
256 | E_USER_ERROR | Fatal user-generated error. This is like an E_ERROR set by the programmer using the PhP程序 function trigger_error() 用户自定义的致命错误 |
512 | E_USER_WARNING | Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PhP程序 function trigger_error() 用户自定义的警告(非致命性错误) |
1024 | E_USER_NOTICE | User-generated notice. This is like an E_NOTICE set by the programmer using the PhP程序 function trigger_error() 用户自定义的提醒(经常是bug,也可能是有意的) |
2048 | E_STRICT | Run-time notices. PhP程序 suggest changes to your code to help interoperability and compatibility of the code 编码标准化警告(建议如何修改以向前兼容) |
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()) 接近致命的运行时错误,若未被捕获则视同E_ERROR |
8191 | E_ALL | All errors and warnings, except level E_STRICT (E_STRICT will be part of E_ALL as of PhP程序 6.0) 除E_STRICT外的所有错误(PhP程序6中为8191,即包含所有) |
好了关于php程序的知识就说到这里希望可以帮助需要的朋友。,PhP程序函数:preg_match()教程
语法:int preg_match ( string $pattern , string $subject [, array $matches [, int $flags ]] )