YA: Simple Pagenation Pg Saving GET vars

<?php
// In response to a Yahoo Answer's Question

if(!isset($_GET['pg'])){
    $_GET['pg'] = 50;
}

function urlVarsMod($name, $value){
    $g = $_GET;
    $g[$name] = $value;
    return http_build_query($g);
}

// Basic Example to show you how to do so
echo '<a href="?' . urlVarsMod('pg',($_GET['pg'] - 1)) . '">Prev</a> [' . $_GET['pg'] . '] <a href="?' . urlVarsMod('pg', ($_GET['pg'] + 1) ) . '">Next</a>';


echo '<h3>Current Page: ' . $_GET['pg'] . '</h3>';
echo '<p>Go Ahead, place some variables in the URL, test away</p>';
echo '<table border="1" cellpadding="5"><tr><th>Name</th><th>Value</th></tr>';
foreach($_GET as $n=>$v){
    echo '<tr><td>' . $n . '</td><td>' . $v . '</td></tr>';
}
echo '</table>';