<form method="post">

    <dl>
        <dt>Country code: (example: 31)</dt>
        <dd><input type="text" name="cc" value="31" /></dd>
        <dt>Phonenumber: (example: +31612345678)</dt>
        <dd><input type="text" name="n" value="+316" /></dd>
        <dt>New status:</dt>
        <dd><input type="text" name="m" /></dd>
        <dd><input type="submit" value="Change!" /></dd>
    </dl>

</form>

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $url = 'https://s.whatsapp.net/client/iphone/u.php';
    $fields = array(
        'cc' => urlencode($_POST['cc']),
        'me' => urlencode($_POST['n']),
        's'  => urlencode(stripslashes(utf8_decode($_POST['m'])))
    );

    //url-ify the data for the POST
    foreach ($fields as $key=>$value) {
        $fields_string .= $key . '=' . $value . '&';
    }
    rtrim($fields_string, '&');

    //open connection
    $ch = curl_init();

    //set the url, number of POST vars, POST data
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, count($fields));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
    curl_setopt($ch, CURLOPT_USERAGENT, "WhatsApp/2.6.7 iPhone_OS/5.0.1 Device/Unknown_(iPhone4,1)");

    //execute post
    $result = curl_exec($ch);

    //close connection
    curl_close($ch);

    echo '<br />Result: ' . $result;
}