Sending XML data using HTTP POST with PHP
you can use cURL library for posting data:http://www.php.net/curl
$ch = curl_init();curl_setopt($ch, CURLOPT_HEADER, 0);curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);curl_setopt($ch, CURLOPT_URL, "http://websiteURL");curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, "XML=".$xmlcontent."&password=".$password."&etc=etc");$content=curl_exec($ch);where postfield contains XML you need to send - you will need to name the postfield the API service (Clickatell I guess) expects
Another option would be file_get_contents():
// $xml_str = your xml// $url = target url$post_data = array('xml' => $xml_str);$stream_options = array( 'http' => array( 'method' => 'POST', 'header' => 'Content-type: application/x-www-form-urlencoded' . "\r\n", 'content' => http_build_query($post_data)));$context = stream_context_create($stream_options);$response = file_get_contents($url, null, $context);