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php Notice: Undefined index 错误提示解决方法_php技巧

May 17, 2016 am 09:23 AM
index undefined

第一种方法:如果不影响程序的正常执行,可以采用屏蔽的方法

可以在代码的第一行 加上
error_reporting(E_ALL ^ E_NOTICE);

关闭掉 NOTICE错误的警告

第二种方法:定位到具体的行,根据提示解决。
例如elseif ($_POST['istrue'] == 'ok'),如上代码,没有提交istrue这个,所以肯定是有问题的。

可以用如下代码解决
上面先判断

复制代码 代码如下:

if(array_key_exists( 'istrue',$_POST))
{
if($_POST[ 'istrue'])
{
$istrue=$_POST[ 'istrue'];
}
}else{
$istrue='';
}

后面的判断可以如下
复制代码 代码如下:

elseif ($istrue == 'ok')

就可以避免此类错误,大家可以参考一些程序的系统是如果做的。
具体的可以参考dedecms活phpcms的代码
复制代码 代码如下:

//检查和注册外部提交的变量
foreach($_REQUEST as $_k=>$_v)
{
if( strlen($_k)>0 && eregi('^(cfg_|GLOBALS)',$_k) )
{
exit('Request var not allow!');
}
}
function _RunMagicQuotes(&$svar)
{
if(!get_magic_quotes_gpc())
{
if( is_array($svar) )
{
foreach($svar as $_k => $_v) $svar[$_k] = _RunMagicQuotes($_v);
}
else
{
$svar = addslashes($svar);
}
}
return $svar;
}

foreach(Array('_GET','_POST','_COOKIE') as $_request)
{
foreach($$_request as $_k => $_v) ${$_k} = _RunMagicQuotes($_v);
}
if(empty($istrue))
{
$istrue = '';
}
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