HTTP_REFERER 获取用户来路实例

http_referer 获取用户来路实例
这是个php教程自来全局变量，所以我们不多介绍了，直接看实例

            if (isset($_server['http_referer'])) {
                    print "the page you were on previously was {$_server['http_referer']}
";
            } else {
                    print "you didn't click any links to get here
";
            }
    ?>

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