What are some best practices for updating older PHP code to work with newer versions of the language?

Updating older PHP code to work with newer versions of the language involves identifying deprecated functions, syntax, or features and replacing them with modern equivalents. It also involves ensuring compatibility with the latest PHP versions by addressing any changes in behavior or requirements. 

// Before updating:
mysql_connect('localhost', 'username', 'password');
mysql_select_db('database');

// After updating:
$mysqli = new mysqli('localhost', 'username', 'password', 'database');
if ($mysqli->connect_error) {
    die('Connection failed: ' . $mysqli->connect_error);
}

Keywords

backward compatibility deprecated functions PHP version code refactoring error handling

Related Questions