Principle and implementation of obtaining real IP address in php_PHP tutorial

 
function get_real_ip(){
if(getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknow")){
$ip = getenv("HTTP_CLIENT_IP");
}else if(getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknow")){
$ip = getenv("HTTP_X_FORWARDED_FOR");
}else if(getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknow")){
$ip = getenv("REMOTE_ADDR");
}else if(isset($_SERVER["REMOTE_ADDR"]) && $_SERVER["REMOTE_ADDR"] && strcasecmp($_SERVER["REMOTE_ADDR"],"unknow")){
$ip = $_SERVER["REMOTE_ADDR"];
}else{
$ip = "unknow";
}
return $ip;
}
echo get_real_ip();
?>

http://www.bkjia.com/PHPjc/477954.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/477954.htmlTechArticle?php function get_real_ip(){ if(getenv(HTTP_CLIENT_IP) strcasecmp(getenv(HTTP_CLIENT_IP), unknow)){ $ip = getenv(HTTP_CLIENT_IP); }else if(getenv(HTTP_X_FORWARDED_FOR) strcasecmp(g...