我如何使用 $_SERVER['HTTP_REFERER'] 来查找来自 google 的用户?

I haven't used $_SERVER['HTTP_REFERER'] before and i dont knw how i can use that to find that user came to my site by clicking on a link in Google search results. User can come from google.com, google.co.uk etc....

非常感谢帮助.

推荐答案

$url = $_SERVER['HTTP_REFERER'];
$query = parse_url ($url, PHP_URL_QUERY);
$host = parse_url ($url, PHP_URL_HOST);
if (strstr ($query, 'q=') && strstr ($host, 'google.')) {
    // user came from google
else {
    // user didnt come from google
}