PossiblyInvalidArrayAccess

Array access is performed on a value that might not be an array.

Example

<?php
function first(array|false $rows): mixed {
    return $rows[0]; // $rows might be false
}

How to fix

Guard with a type check before the array access.

<?php
function first(array|false $rows): mixed {
    if ($rows === false) {
        return null;
    }
    return $rows[0];
}