php script to change ip address

<?php

$proxy = "xx.xx.xx.xx:xx";
$proxy = explode(':', $proxy);
$url = "http://www.google.com";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXY, $proxy[0]);
curl_setopt($ch, CURLOPT_PROXYPORT, $proxy[1]);
curl_setopt($ch, CURLOPT_HEADER, 1);
$exec = curl_exec($ch);

?>

<?PHP
function curlbrowse($url,$proxy_ip,$proxy_port,$loginpassw)
{
    $loginpassw = 'username:password';
    $proxy_ip = 'proxy ip';
    $proxy_port = 'proxy port';
    $url = 'http://www.domain.com';

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_PROXYPORT, $proxy_port);
    curl_setopt($ch, CURLOPT_PROXYTYPE, 'HTTP');
    curl_setopt($ch, CURLOPT_PROXY, $proxy_ip);
    curl_setopt($ch, CURLOPT_PROXYUSERPWD, $loginpassw);
    $data = curl_exec($ch);
    curl_close($ch);

    return $data;
}

?>