What is the potential cause of the "Parse error: unexpected $end" message on line 221 in the PHP code?

The "Parse error: unexpected $end" message on line 221 in PHP code typically indicates that there is a missing closing brace or parenthesis in the code. To solve this issue, you should carefully review the code starting from line 221 and ensure that all opening braces and parentheses have corresponding closing ones.

// Incorrect code with missing closing brace
if ($condition) {
    // Code block
    echo "Hello, World!";
// Missing closing brace here
```

```php
// Corrected code with closing brace added
if ($condition) {
    // Code block
    echo "Hello, World!";
}