Bununla devam et yada google captcha kullan

<?php
$hata1='';
$hata2='';
$hata3='';
include("config.php");
if (!empty($_POST['loginSubmit'])){
    if (empty($_POST['imei'])){
        $hata1='İmei boş bırakılamaz.';
    }else{
$imei=$_POST['imei'];
            $_SESSION['imei']=$imei;
            if(strlen(trim($imei))>1){
                $url=BASE_URL.'home.php';
                header("Location: $url");
            }
}
}
?>
<!DOCTYPE html>
<html lang="tr-TR">
<head>
<meta charset="UTF-8" />
<title>MIUI Türkiye - IMEI Sorgulama</title>
<meta name="description" content=""/>
<meta name="keywords" content=""/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
*{
  -webkit-box-sizing:border-box;
  -moz-box-sizing:border-box;
  box-sizing:border-box;
}

body, html{
  background:#4293D4;
  font-family: 'Open Sans', sans-serif;
}

.container{
  width:400px;
  height:600px;
  background:#fff;
  margin:20px auto;
  border-radius:4px;
  text-align:center;
  position:relative;
  -moz-box-shadow: 0px 0px 28px rgba(0,0,0,.3);
  -webkit-box-shadow: 0px 0px 28px rgba(0,0,0,.3);
   box-shadow: 0px 0px 28px rgba(0,0,0,.3);
   overflow:hidden;
}


.one , .two{
  display:block;
  height:500px;
  width:400px;
  margin:0px auto;
  position:absolute;
  -webkit-transition: all 600ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transition:         all 600ms cubic-bezier(0.175, 0.885, 0.32, 1.275);  
}

.one{
  top:0;
  background:#fff;
  margin-top:20px;
}

.two{
  top:500px;
  background:#ffc107;
}

.two h3{
  color:#fff;
  padding-top:240px;
}

.container .logo{
  width:40%;
  height:auto;
  display:block;
  margin:20px auto;
}

.one  .heading{
  color:#607d8b;
  text-transform:capitalize;
  font-size:20px;
  fonr-weight:900;
  margin-top:40px;
}

.container p{
  font-size:12px;
  color:#b7b7b7;
  font-weight:lighter;
  text-transform:capitalize;
}

input[type='text']{
  width:85%;
  height:60px;
  margin-top:20px;
  margin-bottom:20px;
  padding-bottom:-80px;
  border:none;
  border-bottom:3px solid #ffc107;
  overflow:auto;
  position:relative;
}

input[type='text'].span5 {
  width:50%;
  height:50px;
  margin-top:20px;
  margin-bottom:20px;
  padding-bottom:-80px;
  border:none;
  border-bottom:3px solid #ffc107;
  overflow:auto;
  position:relative;
  right: 20px;
}



input[type='text']:active:focus,
input[type='text']:focus,
input[type='text']:hover{
  outline : none;
  font-size:20px;
}



input[type='text']:focus::-webkit-input-placeholder,
input[type='text']:active:focus::-webkit-input-placeholder
{
  font-size:12px;
  display:block;
  -webkit-transform:translateY(-20px);
  transform:translateY(-20px);
}

::-webkit-placeholder{
  font-size:14px;
  color:#b7b7b7;
  text-transform:capitalize;
  -webkit-transform:translateY(0px);
  transform:translateY(0px);
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;  
}

::placeholder{
  font-size:14px;
  color:#b7b7b7;
  text-transform:capitalize;
  -webkit-transform:translateY(0px);
  transform:translateY(0px);
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;  
}

.one  .btn{
  width:85%;
  background:#ffc107;
  padding:15px;
  border:none;
  border-radius:5px;
  font-size:14px;
  color:#fff;
  text-transform:capitalize;
  font-family: 'Open Sans', sans-serif;
}

.one  .btn:active:focus,
.one  .btn:focus,
.one  .btn:hover{
  outline : none;
}

.one .btn:hover{
  cursor:pointer;
}

.close{
  position:relative;
  top:0;
  left:0;
  display:block;
  cursor:pointer;
}

.close:before{
  content:"";
  position:absolute;
  top:-240px;
  right:50px;
  display:block;
  width:22px;
  height:3px;
  background:#fff;
  -webkit-transform:rotate(45deg);
  transform:rotate(45deg);
}

.close:after{
  content:"";
  position:absolute;
  top:-240px;
  right:50px;
  display:block;
  width:22px;
  height:3px;
  background:#fff;
  -webkit-transform:rotate(-45deg);
  transform:rotate(-45deg);
}
.hata{
  font-size:12px;
  color:#FF0000;
}
.ht{
 position: relative;
 top: 10px;
 right: 25px;
 width: 100px;
 height: 50px;
 border: 3px solid #73AD21;
}
*{margin:0; padding:0;}
    .menu{width:400px; height:48px; background:#000; margin:0 auto;border-bottom:4px solid red;}
    .menu ul li {float:left;list-style-type:none;}
    .menu ul li a{color:#fff; font:17px Arial;text-decoration:none;display:block; padding:14px 15px;transition:all .5s;-webkit-transition:all .5s;-moz-transition:all .5s;}
    .menu ul li a:hover{
        background:red;
        color:white;
    }
</style>
</head>
<body>
<section class="container">
 <section class="one">

  <div class="logo">
    <a href="https://www.miuiturkiye.net/kvk/index.php"><img src="img/a.png"></a>
  </div>
  <h2 class="heading">
    MIUI Türkiye - IMEI Sorgulama
  </h2>
  <p> Aşağıdaki bölüme ımei numaranızı yazınız. <div class="hata"><?php $hatalar="$hata1$hata2$hata3"; echo "$hatalar";?></div>
  </p>
  <form action="index.php" method="post" name="login">
            <div class="input-append">
                <input type="text" name="imei" maxlength="15" pattern="d*" placeholder="IMEI numaranız" onkeypress="return isNumberKey(event)"/>
                <button type="submit" value="Login" name="loginSubmit" class="btn">Sorgula</button>
           
            </div>
  </form>
  </section>
</section>
</body>
</html>