Untitled

<?php
if(isset($_POST['nick']))
{
    $off=1;
    if (preg_match("/^[".chr(0x7F)."-".chr(0xff)."_-]+$/",$_POST['nick']))
    {
        $eracc = 1;
    }
    else
    {
        if(isset($_POST['sum']) && $_POST['sum'] > 0)
        {
			$HOST = '217.106.106.178';
			$USER = 'H29658';
			$PASS = '19057595';
			$NAME = 'EVEBASE29658';
            $nick=$_POST['nick'];
            $sum=$_POST['sum'];
            $connects=mysqli_connect($HOST,$USER,$PASS,$NAME);
            $query = mysqli_query($connects,"SELECT * FROM accounts WHERE name = '$nick'");
            $dans = mysqli_fetch_array($query, MYSQLI_ASSOC);
            if($dans)
            {
                echo ' <META HTTP-EQUIV="REFRESH" CONTENT="0; URL=donateurl">';
            }
            else{
                $eracc = 1;
            }
        }
        else{
            $ersum = 1;
        }
    }
}
?>
<?php include '../head.php'; ?>
<body>
<link href="../css/donate.css" rel="stylesheet">
<title>Apple RP - Донат</title>
<?php
require_once '../js/mobile.php';
$detect = new Mobile_Detect;
if( $detect->isMobile() && !$detect->isTablet() ){
    include 'mdonate.php';;
    echo '<link href="../css/mobile.css" rel="stylesheet">';
    $mobile = 1;
}
?>
<link href="../css/font-awesome.css" rel="stylesheet">
<center><h3 class="main2 fadeInUp animated">Пополнение счета</h3></center>
<section id="main">
        <center>
        <?php
        if(isset($eracc)) echo '<div id="ert">Аккаунт не найден</div>';
        if(isset($ersum)) echo '<div id="ert">Неправильная сумма</div>';
        ?>
        </center>
        <center><section id="forms"></center>
            <center><form action=""  method="post"></center>
                <center><div id="dn"></center>
                <center><div id="input"><i id="icon" class="fa fa-user-o fa-2x" aria-hidden="true"></i><input type="text" name="nick" class="dn" placeholder='ВАШ НИК'></div></div></center>
                <center><div id="dn"></center>
                <center><div id="input"><i id="icon" class="fa fa-rub fa-2x" aria-hidden="true"></i><input type="text" name="sum" class="dv" placeholder="СУММА ПОПОЛНЕНИЯ"></div></div></center>
                <center><div id="dn"><input type="submit" value="Оплатить" class="su"></div></center>
            </form>
    </section>
</body>