header_dump.php

<?php
    # Set a no-cache header header
    header('Cache-Control: max-age=0');
    echo "REMOTE_ADDR: ". $_SERVER['REMOTE_ADDR'] . "<br>";
    $output .= "REMOTE_ADDR: ". $_SERVER['REMOTE_ADDR']."\n";
    foreach (getallheaders() as $name => $value) {
        echo "$name: $value<br>";
        $output .="$name: $value\n";
    }
?>