definitive way to get user ip address php

Question 1

Possible Duplicate:
Function to get user ip address

<?PHP

$ipaddress = $_SERVER["REMOTE_ADDR"];

echo "Your IP is $ipaddress!";

?>

I was told this way of getting ip address has issues such as being able to fool. Is there a better way to gather ip address? looking for tutorials of better way to get ip address?

Question 2

$_SERVER['REMOTE_ADDR'] is the only reliable IP address you'll get - it's extracted directly from the TCP stack and is where the current connection was established from. This means if the user is connecting via a proxy, you'll get the proxy's address, not the user's.

Any of the other header-based ones are unreliable, as HTTP headers are trivial to forge. You can use the information from them, if you'd like, as long as you don't TRUST it.

Question 3

Here's what worked best for me when trying to script this (in case anyone else comes across this like I did):

$ pecl -d php_suffix=5.6 install <package>
$ pecl uninstall -r <package>

$ pecl -d php_suffix=7.0 install <package>
$ pecl uninstall -r <package>

$ pecl -d php_suffix=7.1 install <package>
$ pecl uninstall -r <package>

The -d php_suffix=<version> piece allows you to set config values at run time vs pre-setting them with pecl config-set. The uninstall -r bit does not actually uninstall it (from the docs):

[email protected]:~$ pecl help uninstall
pecl uninstall [options] [channel/]<package> ...
Uninstalls one or more PEAR packages.  More than one package may be
specified at once.  Prefix with channel name to uninstall from a
channel not in your default channel (pecl.php.net)

Options:
  ...
  -r, --register-only
        do not remove files, only register the packages as not installed
  ...

The uninstall line is necessary otherwise installing it will remove any previously installed version, even if it was for a different PHP version (ex: Installing an extension for PHP 7.0 would remove the 5.6 version if the package was still registered as installed).

Question 4

jQuery can handle JSONP, just pass an url formatted with the callback=? parameter to the $.getJSON method, for example:

$.getJSON("https://api.ipify.org/?format=json", function(e) {
    console.log(e.ip);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

This example is of a really simple JSONP service implemented on with api.ipify.org.

If you aren't looking for a cross-domain solution the script can be simplified even more, since you don't need the callback parameter, and you return pure JSON.

Question 5

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");
}

Question 6

Never used any of those, but they look interesting..

Take a look at Gearman as well.. more overhead in systems like these but you get other cool stuff :) Guess it depends on your needs ..

definitive way to get user ip address php

Answers

php