PHP gets user IP address

PHP obtains user IP address

<?php

function getClientIp() {
	$uip = &#39;&#39;;
	if(!empty($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;]) && strcasecmp($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;], &#39;unknow&#39;)) {
		$uip = $_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;];
		strpos($uip, &#39;,&#39;) && list($uip) = explode(&#39;,&#39;, $uip);
	} elseif(!empty($_SERVER[&#39;HTTP_CLIENT_IP&#39;]) && strcasecmp($_SERVER[&#39;HTTP_CLIENT_IP&#39;], &#39;unknow&#39;)) {
		$uip = $_SERVER[&#39;HTTP_CLIENT_IP&#39;];
	} elseif(!empty($_SERVER[&#39;REMOTE_ADDR&#39;]) && strcasecmp($_SERVER[&#39;REMOTE_ADDR&#39;], &#39;unknow&#39;)) {
		$uip = $_SERVER[&#39;REMOTE_ADDR&#39;];
	}
	return $uip;
}
echo getClientIp();

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