$ _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.

Fatal error - headers already sent, undefined index - woocommerce #88 Closed jeremyhalin opened this issue on Feb 28, 2017 · 2 comments ...

This is likely what's causing the error: PHP is looking for an index that doesn't exist because you haven't defined it properly. While you're learning, get used to running your HTML through a ...