How can PHP developers handle undefined offset errors when fetching data from a database query?

When fetching data from a database query in PHP, developers may encounter undefined offset errors when trying to access an index in an array that does not exist. To handle this issue, developers can first check if the index exists in the array before trying to access it. This can be done using the isset() function to prevent undefined offset errors.

// Check if the index exists before accessing it to prevent undefined offset errors
if(isset($result[$index])) {
    $value = $result[$index];
    // Use the value as needed
} else {
    // Handle the case where the index is undefined
    $value = null;
}