Choosing the Right System Event for Region Switching

If a region switch is driven by URL parameters, the best event is the one that sees the request early enough to store the choice before page-specific logic depends on it.

Some Evolution CMS projects keep region state in the session rather than in contexts or separate sites. In that setup, a link like ?region=moscow must be processed early enough that the chosen region is available to the rest of the page logic.

Typical logic

if (isset($_GET['region']) && $_GET['region'] != $_SESSION['region']) {
    if ($_GET['region'] == 'moscow') {
        $_SESSION['region'] = 'moscow';
    } else {
        $_SESSION['region'] = '';
    }
}

What matters most

The exact event should be chosen based on when downstream snippets and templates need the region value. The more your site depends on it during routing or content selection, the earlier in the request flow this logic should run.

Recommendation

Treat region switching as a request-level concern, not a random template trick. The session write should happen before content-building logic begins.

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