What are some best practices for ensuring smooth transition to newer PHP versions, particularly when dealing with legacy scripts and applications?

When transitioning to newer PHP versions, it is important to first identify any deprecated functions or features that may cause issues. Update any legacy scripts or applications to use modern PHP syntax and functions to ensure compatibility. Additionally, testing the updated code thoroughly before deploying it to production can help catch any potential issues early on. 

// Example code snippet for updating deprecated function mysql_connect to mysqli_connect
$host = 'localhost';
$user = 'username';
$pass = 'password';
$db = 'database';

// Deprecated function
$conn = mysql_connect($host, $user, $pass);

// Updated function
$conn = mysqli_connect($host, $user, $pass, $db);

Keywords

backward compatibility PHP migration tools deprecated functions error handling code refactoring

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