获取用户IP地址的功能 [英] Function to get user ip address

问题描述

可能重复:
什么是

Possible Duplicate:
What is the most accurate way to retrieve a user's correct IP address in PHP?

php中是否有更好的功能来获取用户ip地址? 这就是我目前使用的

Is there any better function in php to get user ip address? this is what i use at the moment

function GetIP()
{
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
$ip = $_SERVER['REMOTE_ADDR'];
else
$ip = "unknown";
return($ip);
}

推荐答案

好，您的函数应具有预期的功能，但是这里有一些建议:

Well, your function should behave as expected, but here are some suggestions:

// lowercase first letter of functions. It is more standard for PHP
function getIP() 
{
    // populate a local variable to avoid extra function calls.
    // NOTE: use of getenv is not as common as use of $_SERVER.
    //       because of this use of $_SERVER is recommended, but 
    //       for consistency, I'll use getenv below
    $tmp = getenv("HTTP_CLIENT_IP");
    // you DON'T want the HTTP_CLIENT_ID to equal unknown. That said, I don't
    // believe it ever will (same for all below)
    if ( $tmp && !strcasecmp( $tmp, "unknown"))
        return $tmp;

    $tmp = getenv("HTTP_X_FORWARDED_FOR");
    if( $tmp && !strcasecmp( $tmp, "unknown"))
        return $tmp

    // no sense in testing SERVER after this. 
    // $_SERVER[ 'REMOTE_ADDR' ] == gentenv( 'REMOTE_ADDR' );
    $tmp = getenv("REMOTE_ADDR");
    if($tmp && !strcasecmp($tmp, "unknown"))
        return $tmp;

    return("unknown");
}

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