Message: Trying to access array offset on value of type null

This error message is indicating that you are trying to access an array offset (i.e., an element of an array) but the value being accessed is null.

Here is an example of code that would trigger this error:

<?php

$arr = [];
echo $arr[0];

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To fix this error, you will need to make sure that the value you are trying to access is not null. This might involve initializing the array or checking that the value is not null before trying to access it.

<?php

$arr = [];  // Initialize the array

if (isset($arr[0])) {
  echo $arr[0];  // This will not trigger an error
} else {
  echo 'index does not exist';
}