php 获取本机外网/公网IP 大家一般都是用$_SERVER[&＃39;REMOTE_ADDR&＃39;]来获取用户IP&＃xff0c;
但是如果使用了反向代理的&＃xff0c;HTTP头中REMOTE_ADDR就不是用户的地址&＃xff0c;反而是上一级代理的地址了。
经过我的研究有两种方法来获取用户的真实外网IP。
方法一&＃xff1a;curl
代码 function get_onlineip() {
$ch &＃61; curl_init(&＃39;http://www.ip138.com/ip2city.asp&＃39;);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$a &＃61; curl_exec($ch);
preg_match(&＃39;/\[(.*)\]/&＃39;, $a, $ip);
return $ip[1];
}
$ch &＃61; curl_init(&＃39;http://www.ip138.com/ip2city.asp&＃39;);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$a &＃61; curl_exec($ch);
preg_match(&＃39;/\[(.*)\]/&＃39;, $a, $ip);
return $ip[1];
}
方法二&＃xff1a;$_SERVER[&＃39;HTTP_X_FORWARDED_FOR&＃39;]来获取相应的地址
代码 function get_onlineip() {
$onlineip &＃61; &＃39;&＃39;;
if(getenv(&＃39;HTTP_CLIENT_IP&＃39;) && strcasecmp(getenv(&＃39;HTTP_CLIENT_IP&＃39;), &＃39;unknown&＃39;)) {
$onlineip &＃61; getenv(&＃39;HTTP_CLIENT_IP&＃39;);
} elseif(getenv(&＃39;HTTP_X_FORWARDED_FOR&＃39;) && strcasecmp(getenv(&＃39;HTTP_X_FORWARDED_FOR&＃39;), &＃39;unknown&＃39;)) {
$onlineip &＃61; getenv(&＃39;HTTP_X_FORWARDED_FOR&＃39;);
} elseif(getenv(&＃39;REMOTE_ADDR&＃39;) && strcasecmp(getenv(&＃39;REMOTE_ADDR&＃39;), &＃39;unknown&＃39;)) {
$onlineip &＃61; getenv(&＃39;REMOTE_ADDR&＃39;);
} elseif(isset($_SERVER[&＃39;REMOTE_ADDR&＃39;]) && $_SERVER[&＃39;REMOTE_ADDR&＃39;] && strcasecmp($_SERVER[&＃39;REMOTE_ADDR&＃39;], &＃39;unknown&＃39;)) {
$onlineip &＃61; $_SERVER[&＃39;REMOTE_ADDR&＃39;];
}
return $onlineip;
}
$onlineip &＃61; &＃39;&＃39;;
if(getenv(&＃39;HTTP_CLIENT_IP&＃39;) && strcasecmp(getenv(&＃39;HTTP_CLIENT_IP&＃39;), &＃39;unknown&＃39;)) {
$onlineip &＃61; getenv(&＃39;HTTP_CLIENT_IP&＃39;);
} elseif(getenv(&＃39;HTTP_X_FORWARDED_FOR&＃39;) && strcasecmp(getenv(&＃39;HTTP_X_FORWARDED_FOR&＃39;), &＃39;unknown&＃39;)) {
$onlineip &＃61; getenv(&＃39;HTTP_X_FORWARDED_FOR&＃39;);
} elseif(getenv(&＃39;REMOTE_ADDR&＃39;) && strcasecmp(getenv(&＃39;REMOTE_ADDR&＃39;), &＃39;unknown&＃39;)) {
$onlineip &＃61; getenv(&＃39;REMOTE_ADDR&＃39;);
} elseif(isset($_SERVER[&＃39;REMOTE_ADDR&＃39;]) && $_SERVER[&＃39;REMOTE_ADDR&＃39;] && strcasecmp($_SERVER[&＃39;REMOTE_ADDR&＃39;], &＃39;unknown&＃39;)) {
$onlineip &＃61; $_SERVER[&＃39;REMOTE_ADDR&＃39;];
}
return $onlineip;
}
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