What are the best practices for updating PHP scripts to be compatible with newer PHP versions, such as PHP5 and beyond?

To update PHP scripts to be compatible with newer PHP versions such as PHP5 and beyond, it is important to review the deprecated features and functions in the older PHP version and replace them with newer alternatives. Additionally, ensure that the code follows the latest syntax and conventions recommended by the newer PHP version. 

// Before PHP 5.3, the "mysql_" functions were commonly used for database operations
// To update to PHP 5.6 and beyond, switch to using "mysqli_" functions or PDO for database connectivity

// Deprecated code using "mysql_" functions
$connection = mysql_connect('localhost', 'username', 'password');
mysql_select_db('database_name', $connection);
$result = mysql_query('SELECT * FROM table', $connection);

// Updated code using "mysqli_" functions
$connection = mysqli_connect('localhost', 'username', 'password', 'database_name');
$result = mysqli_query($connection, 'SELECT * FROM table');

// Updated code using PDO
$connection = new PDO('mysql:host=localhost;dbname=database_name', 'username', 'password');
$statement = $connection->query('SELECT * FROM table');

Keywords

backward compatibility deprecated functions PHP migration error handling version control

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