In the provided code snippet, what potential issues or pitfalls can be identified in the logic of checking array indices within a foreach loop?

The potential issue in checking array indices within a foreach loop is that the loop iterates over each element in the array, not the indices themselves. Therefore, directly accessing the indices within the loop may lead to unexpected behavior or errors. To solve this issue, you can use the `foreach` loop to iterate over the array elements directly and use `key()` function to get the index if needed.

// Potential issue in the original code
$array = [1, 2, 3];
foreach ($array as $index => $value) {
    if ($index == 1) {
        echo "Value at index 1: $value";
    }
}

// Fix using key() function to get the index
$array = [1, 2, 3];
foreach ($array as $value) {
    $index = key($array);
    if ($index == 1) {
        echo "Value at index 1: $value";
    }
}