$ _POST or $ _GET are two special PHP functions that are used to get variables from a user-filled form. While using these functions, a user may encounter an error, stating that there is an undefined ...

This example demonstrates a common error in PHP when working with arrays and foreach loops: the undefined index notice. This error occurs when you try to access an array key that doesn't exist.

This example demonstrates a common error in PHP when working with arrays and foreach loops: the undefined index notice. This error occurs when you try to access an array key that doesn't exist.