How PHP gets the city based on the IP address

Source: Internet
Author: User
This article mainly to share with you how PHP based on IP address to obtain the city, this article mainly in the form of code, I hope to help everyone.

<?phpheader (' content-type:text/html;    Charset=utf-8 '); function GetIP () {$realip = ';    $unknown = ' unknown '; if (Isset ($_server)) {if (Isset ($_server[' http_x_forwarded_for ')) &&!empty ($_server[' http_x_forwarded_for ') ]) && strcasecmp ($_server[' http_x_forwarded_for '), $unknown)) {$arr = explode (', ', $_server[' http_x_for            Warded_for ']);                foreach ($arr as $ip) {$ip = Trim ($IP);                    if ($ip! = ' Unknown ') {$realip = $ip;                Break }}}else if (Isset ($_server[' http_client_ip ') &&!empty ($_server[' http_client_ip ']) &&        STRCASECMP ($_server[' http_client_ip '), $unknown)) {$realip = $_server[' http_client_ip ']; }else if (isset ($_server[' remote_addr ") &&!empty ($_server[' remote_addr ']) && strcasecmp ($_server[')        Remote_addr '], $unknown)) {$realip = $_server[' remote_addr '); }else{$reaLip = $unknown;            }}else{if (getenv (' http_x_forwarded_for ') && strcasecmp (getenv (' http_x_forwarded_for '), $unknown)) {        $realip = getenv ("Http_x_forwarded_for"); }else if (getenv (' http_client_ip ') && strcasecmp (getenv (' http_client_ip '), $unknown)) {$realip = getenv (        "Http_client_ip"); }else if (getenv (' remote_addr ') && strcasecmp (getenv (' remote_addr '), $unknown)) {$realip = getenv ("Remot        E_addr ");        }else{$realip = $unknown; }} $realip = Preg_match ("/[\d\.") {7,15}/", $realip, $matches)?    $matches [0]: $unknown; return $realip;}    function Getiplookup ($ip = ") {if (empty ($ip)) {$ip = GetIP ();    } $res = @file_get_contents (' http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip= '. $ip);    if (empty ($res)) {return false;}    $jsonMatches = Array ();    Preg_match (' #\{.+?\}# ', $res, $jsonMatches);    if (!isset ($jsonMatches [0])) {return false;} $json = Json_decode ($jsonMatches [0], true);        if (Isset ($json [' ret ']) && $json [' ret '] = = 1) {$json [' IP '] = $IP;    unset ($json [' ret ']);    }else{return false; } return $json;} $ipInfos = Getiplookup (' 123.125.114.144 '); Baidu.com IP 鍦 Board from Var_dump ($ipInfos);? >

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