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Как решить постоянную ошибку Notice: Undefined index...?

Undefined index error in codeigniter

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Ошибка Notice: Undefined index - PHP - Киберфорум

Ошибка Notice: Undefined index: Помогите пожалуйста, у меня форма обратной связи выдает вот такие ошибки: Notice: Undefined... Сайт на opencart ошибка PHP Notice: Undefined index: email Доброго дня.

php - Codeigniter Error Undefined index: (PHP, CodeIgniter)

Notice: Undefined Index error in PHP

[SOLVED] Probably simple: $_REQUEST['username'] Undefined...

Message: Undefined index: username. I think it's because the $_request is null (which is right -- as the page has been deliberately loaded wrong), but instead of just leaving it unset for the php code to pick it up, codeigniter is displaying an error.