How can the "Undefined offset" error be avoided when accessing array indexes in PHP?

When accessing array indexes in PHP, the "Undefined offset" error occurs when trying to access an index that does not exist in the array. To avoid this error, you should always check if the index exists before trying to access it. This can be done using the isset() function to verify the existence of the index.

// Avoiding "Undefined offset" error when accessing array indexes in PHP
if(isset($array[$index])) {
    // Access the array index here
    $value = $array[$index];
    echo $value;
} else {
    // Handle the case where the index does not exist
    echo "Index does not exist in the array";
}