How to get the final redirected url using php?

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$url = 'http://example.com';

function getFinalUrl($url) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_exec($ch);
    $finalUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    curl_close($ch);
    return $finalUrl;
}

$finalUrl = getFinalUrl($url);
echo $finalUrl;