You can use tor proxy, here is the script:
<?php
function tor_new_identity($tor_ip='127.0.0.1', $control_port='9051',$auth_code='saad'){
$fp = fsockopen($tor_ip, $control_port, $errno, $errstr, 30);
if (!$fp) return false; //can't connect to the control port
fputs($fp, "AUTHENTICATE $auth_code\r\n");
$response = fread($fp, 1024);
list($code, $text) = explode(' ', $response, 2);
if ($code != '250') return false; //authentication failed
//send the request to for new identity
fputs($fp, "signal NEWNYM\r\n");
$response = fread($fp, 1024);
list($code, $text) = explode(' ', $response, 2);
if ($code != '250') return false; //signal failed
fclose($fp);
return true;
}
?>
Call the function "if (tor_new_identity('127.0.0.01', '9051')) {//do stuffs here}"
But you must install the tor system in the VPS 1st.