PHP 8.1 throws error Uncaught TypeError: Cannot access offset of type string on string

I am checking all my code in readiness for upgrading to PHP 8.1.

The following lines of code work fine in PHP7.4 but throws the above error on the line starting with "$pcount" in PHP 8.1

foreach ($products as $product) {
            $pcount[$product['HospitalProductID']] += 1;
        }

The $product array looks like this:

(
    [HospitalProductID] => 260
    [HospitalProtocolID] => 82
)

Any idea why PHP 8.1 does not like this code?

source https://stackoverflow.com/questions/70628519/php-8-1-throws-error-uncaught-typeerror-cannot-access-offset-of-type-string-on

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