一个取得客户端IP的函数

<?php
functiontep_get_ip_address(){
if(isset($_SERVER)){
if(isset($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;])){
$ip=$_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;];
}elseif(isset($_SERVER[&#39;HTTP_CLIENT_IP&#39;])){
$ip=$_SERVER[&#39;HTTP_CLIENT_IP&#39;];
}else{
$ip=$_SERVER[&#39;REMOTE_ADDR&#39;];
}
}else{
if(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;)){
$ip=getenv(&#39;HTTP_X_FORWARDED_FOR&#39;);
}elseif(getenv(&#39;HTTP_CLIENT_IP&#39;)){
$ip=getenv(&#39;HTTP_CLIENT_IP&#39;);
}else{
$ip=getenv(&#39;REMOTE_ADDR&#39;);
}
}
return$ip;
}
echotep_get_ip_address();
?>