это должно сделать трюк:
<?php
include_once('simple_html_dom.php');
$url = '<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>
<body>
<div class="waitmsg" id="WaitMessage" style="display:none">
<WaitMessage>Transaction Processing, Please Wait...</WaitMessage>
</div>
<form id="mpiRun" action="form.php" method="post">
<input type="hidden" name="dest" value="33777" />
<input type="hidden" name="one" value="102900" />
<br>
<br>
<noscript>
<center>
<h1>Processing Transaction</h1>
<input type="submit" />
</center>
</noscript>
</form>';
$html = str_get_html($url);
$arr = [];
foreach ($html->find('input') as $element) {
if ($element->type == "hidden") {
$arr[$element->name] = $element->value;
}
}