在PHP4.2以后版本中使用表格数据
正如文章标题一样，将会有越来越多关于PHP4.2以后版本出版和register_globals的讨论。 如果你的PHP程序以前工作正常，但是升级到PHP4.2以后出错的话，请仔细阅读以下内容： 以前，在你的PHP中，可能有一个像下面表格： 而且，你可以像下面一样简单的访问你的变量： 当升级到PHP4.2版本的时候出问题了--在安装的时候，PHP默认设置了register_globals=off，这个register_globals是php.ini中设置是否允许直接使用变量上面例子中$variable的参数，直到PHP4.2以前的版本，register_globals都是默认为on，也就说可以直接输出变量。然而，在PHP4.2以后的版本中，为了防止潜在的不安全代码的溢出，PHP开发组已经将register_globals默认为off。 这就意味着以上的代码不再有输出。 [译者注：通过一系列PHP函数的处理，也可以在register_globals=off的时候直接访问变量。] 实际上，使用以上表格的时候，我们可以通过几种方式访问输入的值。 因为我们使用了POST方式来提交数据，我们可以使用_POST数组，例如： 或者，如果以上的表格通过GET方式提交，我们可以使用_GET数组： 如果你出于某种因素不知道你使用了POST还是GET方式提交数据，你可以全部使用_REQUEST数组，例如： cookies和会话(sessions)相应的数组变量名称是_COOKIE和_SESSION，可以通过相同的方法来访问变量的值。还有_SERVER, _FILES, _ENV和GLOBALS数组，这些都是PHP的全局变量，可以用于PHP的任何地方，包括用在函数和类中。 以下代码也可以正常工作： $value ) echo "$_POST[$key] => $value
"; } ?> 你不需要在函数中使用语句global $_POST;，就可以直接使用这个全局变量了。 更多的内容，请参考PHP在线手册： http://www.php.net/manual/en/language.variables.predefined.php
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