Undefined index error [closed]

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i am trying to Post something but keep getting Undefined index error. I have encountered this problem before and using if(isset($_POST['in_come']) solved my previous problem. But, now it does not. What can cause this problem? Everything seems correct.Html posts an input and php should have gotten it Thanks

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The problem is caused by you trying to access an array index that doesn't exist. E.g:

$foo = array('bar');
echo $foo[99999];

That means you have a logic error somewhere in your code.

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This error is caused by passing an invalid index to an array, whether it be a string or integer index. Using if(isset($_POST['in_come']) should return false if it doesn't exist though, and not throw an error. If you would post your code, people could be more helpful