Hello, Version 1.5.x requires PHP 5.4-7.4 as per README.md Downgrade to PHP 7.4 or use the 'master branch' for PHP 8.x.

PHP Undefined Array Key Access This repository demonstrates a common yet subtle bug in PHP: accessing undefined array keys. PHP's flexible nature can mask these issues, leading to unexpected behavior ...

But for the developers who are using PHP 5.5 or greated version. PHP itself having the this facility and it's name is array_column. This is an inbuilt function for PHP which uses two PARAM, given ...

Is there a PHP function that can compare all 4 arrays, sum the values of duplicate keys and returns an array with all the sums?<BR><BR>Is that well enough explained?

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 ...

$ _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 ...