How to check the October CMS version

Sometimes you need to use different logic depending on the October CMS version. Here is a way for you to check the exact version.

A simple way to check if it is v2 or above:

if (class_exists('System'))  {
    // Running October CMS 2.0 or above
}
else {
    // Running October CMS 1.0
}

For more precise checking, this will check if it is v2.2 or above:

if (class_exists('System') && version_compare(\System::VERSION, '2.2') !== -1) {
    // Running October CMS v2.2 or above
}