Website is a mirror. How to detect this programmatically in php? -

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for example have 4g-market.ru mirror peterhost.ru. how can detect programmatically?

this function detects single-bounce redirect (site1 -> site2, not site1 -> site3 -> site2):

function isredirect($url) {   $headers = get_headers($url, true);    $status = $headers[0];   list($protocol, $code, $message) = split(' ', $status, 3);    return ($code >= 300 && $code < 400); }

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