From MediaWiki.org
<?php
// Customization required:
$endpoint ='http://server/wiki/extensions/AddPageService.php';
$user ="my.user";
$password ="******";
$title ="AddPageService Test Page";
$text =<<<EOT
This is a test page.
Testing [http://www.mediawiki.org/wiki/Extension:AddPageService AddPageService].
EOT;
// End of customization section
require ('SOAP/Client.php');
$AddPageService=new SOAP_Client($endpoint);
$method ='addPage';
$params=array
(
'title' => utf8_encode($title),
'text' => utf8_encode($text),
'user' => $user,
'password' => $password
);
$options = array
(
'timeout' => 30,
);
$result=$AddPageService->call($method, $params, $options);
print_r ($result);