What potential pitfalls should one be aware of when migrating from PHP 4.3.x to PHP 5.x with regards to MySQL?

One potential pitfall when migrating from PHP 4.3.x to PHP 5.x with regards to MySQL is the deprecated use of the mysql extension in PHP 5.x. It is recommended to switch to either the mysqli or PDO extension for database connectivity to ensure compatibility and security with newer PHP versions. 

// Connect to MySQL using mysqli extension
$mysqli = new mysqli('localhost', 'username', 'password', 'database');

// Check for connection errors
if ($mysqli->connect_error) {
    die('Connection failed: ' . $mysqli->connect_error);
}

Keywords

PHP 4.3.x PHP 5.x MySQL backward compatibility deprecated functions

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