What steps can be taken to debug PHP code when encountering errors like the "Undefined offset" notice?

When encountering an "Undefined offset" notice in PHP, it means that you are trying to access an array index that does not exist. To solve this issue, you should check if the index exists before trying to access it. This can be done using the isset() function to verify if the offset is set in the array.

// Check if the index exists before accessing it
if(isset($array[$index])) {
    // Access the index if it exists
    $value = $array[$index];
    // Use the value as needed
} else {
    // Handle the case where the index is undefined
    echo "Index is undefined";
}