Php code used to obtain the IP address of the client-PHP source code

The simplest way to get the client IP address is to directly use REMOTE_ADDR, but this kind of IP address cannot be obtained if there is a proxy IP address, so we need to use HTTP_X_FORWARDED_FOR to obtain it, next, I will introduce you to a function for obtaining IP addresses from the client. Our simplest method is to directly use REMOTE_ADDR, but this method cannot be obtained if a proxy IP address exists, therefore, we need to use HTTP_X_FORWARDED_FOR to obtain the IP address. Next we will introduce a function for getting the IP address.

Script ec (2); script

Simplest practice

The Code is as follows:
Function getRealIpAddr () { If (! Emptyempty ($ _ SERVER ['HTTP _ CLIENT_IP ']) { $ Ip = $ _ SERVER ['HTTP _ CLIENT_IP ']; } Elseif (! Emptyempty ($ _ SERVER ['HTTP _ X_FORWARDED_FOR ']) // To check ip is pass from proxy { $ Ip = $ _ SERVER ['HTTP _ X_FORWARDED_FOR ']; } Else { $ Ip = $ _ SERVER ['remote _ ADDR ']; } Return $ ip; }

I wrote this myself.

The Code is as follows:

If (getenv ('HTTP _ CLIENT_IP ') & strcasecmp (getenv ('HTTP _ CLIENT_IP'), 'unknown ')){ $ Onlineip = getenv ('HTTP _ CLIENT_IP '); } Elseif (getenv ('HTTP _ X_FORWARDED_FOR ') & strcasecmp (getenv ('HTTP _ X_FORWARDED_FOR'), 'unknown ')){ $ Onlineip = getenv ('HTTP _ X_FORWARDED_FOR '); } Elseif (getenv ('remote _ ADDR ') & strcasecmp (getenv ('remote _ ADDR'), 'unknown ')){ $ Onlineip = getenv ('remote _ ADDR '); } Elseif (isset ($ _ SERVER ['remote _ ADDR ']) & $ _ SERVER ['remote _ ADDR '] & strcasecmp ($ _ SERVER ['remote _ ADDR'], 'unknown ')){ $ Onlineip = $ _ SERVER ['remote _ ADDR ']; } Echo $ onlineip; ?>

However, Baidu found

Instance

The Code is as follows:

Function real_ip (){ Static $ realip = NULL; If ($ realip! = NULL ){ Return $ realip; } If (isset ($ _ SERVER )){ If (isset ($ _ SERVER ['HTTP _ X_FORWARDED_FOR ']) { $ Arr = explode (',', $ _ SERVER ['HTTP _ X_FORWARDED_FOR ']); /* Obtain the first non-unknown valid IP string in X-Forwarded-*/ Foreach ($ arr AS $ ip ){ $ Ip = trim ($ ip ); If ($ ip! = 'Unknown '){ $ Realip = $ ip; Break; } } } Elseif (isset ($ _ SERVER ['HTTP _ CLIENT_IP ']) { $ Realip = $ _ SERVER ['HTTP _ CLIENT_IP ']; } Else { If (isset ($ _ SERVER ['remote _ ADDR ']) { $ Realip = $ _ SERVER ['remote _ ADDR ']; } Else { $ Realip = '0. 0.0.0 '; } } } Else { If (getenv ('HTTP _ X_FORWARDED_FOR ')){ $ Realip = getenv ('HTTP _ X_FORWARDED_FOR '); } Elseif (getenv ('HTTP _ CLIENT_IP ')){ $ Realip = getenv ('HTTP _ CLIENT_IP '); } Else { $ Realip = getenv ('remote _ ADDR '); } } Preg_match ("/[d.] {7, 15}/", $ realip, $ onlineip ); $ Realip =! Empty ($ onlineip [0])? $ Onlineip [0]: '0. 0.0.0 '; Return $ realip; }