php获取访客ip地址的方法

<p><?php </p><p> function ip() { </p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/7fc7563c4182" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">PHP免费学习笔记（深入）</a>”；</p><p>if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) { </p><p>$ip = getenv('HTTP_CLIENT_IP'); </p><p>} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) { </p><p>$ip = getenv('HTTP_X_FORWARDED_FOR');</p><p> } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) { </p>
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                            <p>PHP获取访客IP和地理位置信息的类</p>
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                <p>$ip = getenv('REMOTE_ADDR'); </p><p>} elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) { </p><p>$ip = $_SERVER['REMOTE_ADDR']; </p><p>} </p><p>return preg_match("/[\d\.]{7,15}/", $ip, $matches) ? $matches[0] : 'unknown'; </p><p>}</p><p>?></p>