What best practices should be followed when updating PHP scripts to newer versions for compatibility and security reasons?

When updating PHP scripts to newer versions for compatibility and security reasons, it is important to review the changes in the PHP version documentation to identify any deprecated features that need to be updated. Additionally, make sure to test the updated scripts thoroughly to ensure they work as expected with the new PHP version. It is also recommended to keep backups of the original scripts in case any issues arise during the update process. 

// Example of updating PHP script to use mysqli instead of deprecated mysql extension
// Before: $conn = mysql_connect('localhost', 'username', 'password');
// After: $conn = mysqli_connect('localhost', 'username', 'password');
$conn = mysqli_connect('localhost', 'username', 'password');
if (!$conn) {
    die('Could not connect: ' . mysqli_error());
}
echo 'Connected successfully';
mysqli_close($conn);

Keywords

backward compatibility security vulnerabilities deprecated functions PHP version code refactoring

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