getenv

(PHP 4, PHP 5)

getenv — Obtém uma variável de ambiente

Descrição

string getenv ( string $varname )

Retorna o nome da variável de ambiente varname , ou FALSE em caso de erro.


<?php
$ip = getenv("REMOTE_ADDR"); // obtém o número ip do usuário
?>

Você poderá ver uma lista de todas as variáveis de ambiente usando phpinfo(). Você poderá encontram o que muitas delas indicam dando uma olhada em » CGI specification, especialmente em » page on environmental variables.

Nota: Esta função não funciona no modo ISAPI.

Veja também putenv().

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get_required_files

Last updated: Fri, 13 Nov 2009

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getenv

f dot hartmann2 at gmx dot net
23-Jul-2009 10:42


A function returning the remote adress of the visiting browser could look like this:





<?php


function getIPfromXForwarded() {


    $ipString=@getenv("HTTP_X_FORWARDED_FOR");


    $addr = explode(",",$ipString);


    return $addr[sizeof($addr)-1];


}


?>





Note that some adresses are followed by a whitespace and ip2long(getIPfromXForwarded()) would not return the expected result.





Make use of trim() in your scripts, either in the function itself, or the surrounding space of the caller.





Greetings

estarapapax at gmail dot com
19-Feb-2009 03:19


This is a sample function for checking if your visitor comes from this certain country. This is especially useful for amateur webmasters who don't want to use sql databases.





Sample use of function:


<?php


if(check_coutry('http://www.domain.com/files/philippines.csv') === true)


      echo 'You are from the Philippines';


?>





Basically, you'll need CSV (or TXT) which lists the IP ranges of a certain country. Example (excerpt of the philippines.csv only):





58.69.0.0, 58.69.255.255


58.71.0.0, 58.71.127.255


61.9.0.0, 61.9.127.255


61.14.28.0, 61.14.28.63


61.14.41.136, 61.14.41.143


and so on until the end





You may obtain these CSV files in a number of websites out there. Be sure to update these CSV files regularly as these IP ranges change from time to time.





Here is the function:


<?php


function check_country($url_csv){


$curl_handle = curl_init();


curl_setopt($curl_handle, CURLOPT_URL, $url_csv);


curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);


$str_fromfile = curl_exec($curl_handle);


curl_close($curl_handle);


$range = explode("\n", $str_fromfile);





$ip_addr = getenv(REMOTE_ADDR); //gets the IP of the visitor


$ip_byte = explode('.', $ip_addr);


$ip_number = (16777216 * (int) $ip_byte[0]) + (65536 * (int) $ip_byte[1]) + (256 * (int) $ip_byte[2]) + ((int) $ip_byte[3]);





for($i = 0; $range[$i] != NULL && $is_positive == NULL; $i++){ // the condition $line[$i] != NULL means that you should not put blank lines before the end of your CSV. The values should start at line 1.


    $range[$i] = rtrim(ltrim($range[$i])); //you may remove this if you are sure the CSV doesnt contain whitespaces


    $ends_addr = explode(',', $range[$i]); //for CSV (comma-separated values), comma is the separator. You may change this if your TXT uses different separator.


    $ends_addr[0] = rtrim($ends_addr[0]); //again, you may remove this if your CSV is free from whitespaces


    $ends_addr[1] = ltrim($ends_addr[1]); //yet, again


    $start_ip_byte = explode('.', $ends_addr[0]);


    $end_ip_byte = explode('.', $ends_addr[1]);


    $start_ip_number = (16777216 * (int) $start_ip_byte[0]) + (65536 * (int) $start_ip_byte[1]) + (256 * (int) $start_ip_byte[2]) + ((int) $start_ip_byte[3]);


    $end_ip_number = (16777216 * (int) $end_ip_byte[0]) + (65536 * (int) $end_ip_byte[1]) + (256 * (int) $end_ip_byte[2]) + ((int) $end_ip_byte[3]);


       


    if($ip_number >= $start_ip_number && $ip_number <= $end_ip_number)


            $is_positive = 1;


}


   


    if($is_positive == 1)


        return true;


    else


        return false;


}


?>

sam at sambarrow dot com
12-Mar-2008 11:32


SERVER_NAME is the name defined in the apache configuration.

HTTP_HOST is the host header sent by the client when using the more recent versions of the http protocol.

renko at <remove>virtual-life dot net
08-Nov-2004 12:40


The function 'getenv' does not work if your Server API is ASAPI (IIS).



So, try to don't use getenv('REMOTE_ADDR'), but $_SERVER["REMOTE_ADDR"].

kyong
04-Feb-2004 07:06


As you know, getenv('DOCUMENT_ROOT') is useful.

However, under CLI environment(I tend to do quick check

if it works or not), it doesn't work without modified php.ini

file. So I add "export DOCUMENT_ROOT=~" in my .bash_profile.

daman at SPAM_BlockERmralaska dot com
08-Sep-2002 11:37


Be careful using HTTP_X_FORWARDED_FOR in conditional statements collecting the IP address. Sometimes the user's LAN address will get forwarded, which of course is pretty worthless by itself.

alex at acid-edge dot net
23-Jul-2002 03:32


Note that some caches seem to send the client-ip header *backwards*. be careful :)

john-php at pc dot xs4all dot nl
15-Aug-2000 11:56


Note that the X-Forwarded for header might contain multiple addresses, comma separated, if the request was forwarded through multiple proxies.





Finally, note that any user can add an X-Forwarded-For header themselves. The header is only good for traceback information, never for authentication. If you use it for traceback, just log the entire X-Forwarded-For header, along with the REMOTE_ADDR.

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getlastmod

get_required_files

Last updated: Fri, 13 Nov 2009