出错操作_PHP
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。
所有的PHP表达式都可以使用前缀“@”来调用，对于这种特殊的表达式将关闭错误报告。如果一个错误在运行这样一个表达式时发生了，而且“track error”特性被置为可用，那么用户可以在全局变量$php_errormsg中找到这些错误信息。
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