php Undefined variable和 Undefined index

undefined variable和 undefined index：出现这种问题是变量未定义了，我们只要把加个验证如

$a =isset($_get['aa'])?$_get['aa']:'变量未定义';

这样未定义变量也不会出现undefined variable和undefined index提示，同时我们还提供在php ini或在php中设置错误不提示的方法。

解决方法：

1) error_reporting设置：找到error_reporting = e_all

修改为error_reporting = e_all & ~e_notice

2) register_globals设置：找到register_globals = off

修改为register_globals = on

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