What are the potential pitfalls of using outdated PHP code and how can they be avoided?

Using outdated PHP code can lead to security vulnerabilities, compatibility issues with newer PHP versions, and decreased performance. To avoid these pitfalls, it is important to regularly update your PHP codebase to utilize the latest features and security patches.

// Example of updating outdated PHP code to avoid pitfalls
// Before updating:
$old_array = array("apple", "banana", "cherry");
foreach($old_array as $fruit) {
    echo $fruit;
}

// After updating:
$new_array = ["apple", "banana", "cherry"];
foreach($new_array as $fruit) {
    echo $fruit;
}