
<?php
if($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['object_url'])) {
    $url = $_POST['object_url'];
    file_put_contents(__FILE__ . '-url.txt', $url);
} else {
    $url = file_get_contents(__FILE__ . '-url.txt');
}
?>
<form action="<?php echo htmlspecialchars($url); ?>" method="GET" id="prim-control" target="responseframe">
</form>