How to check HTTPS

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$_SERVER['HTTPS'] - this check HTTPS or HTTP
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$_SERVER['SERVER_NAME'] - this return server name
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$_SERVER['REQUEST_URI'] - this return client request
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//assign the URL to variable
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$url = (!empty($_SERVER['HTTPS'])) ? "https://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'] : "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
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//display the URL
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echo $url;