Answer:              Clientinterface.
php
<!DOCTYPE html>
<html>
<head>
         <meta charset="utf-8">
         <meta name="viewport" content="width=device-width, initial-scale=1">
         <title>web</title>
         <style>
                   fieldset{heigt: 50%; width: 30%;}
         </style>
</head>
<body>
<fieldset>
                <legend><strong>Register</strong></legend>
<form action="conn.php" method="post">
        *requiredfields<br>
        Your Full Name*:<br>
          <input type="text" name="n1" required>
        <br><br>
        Email Address*:<br>
        <input type="email" name="n2" required>
        <br><br>
        User Name*:<br>
        <input type="text" name="n3" required>
        <br><br>
        Password*:<br>
        <input type="text" name="n4" required><br><br>
        <input type="submit" name="n5" value="Submit">
</form>
</fieldset>
</body>
</html>
conn.php
<?php
if(isset($_POST['n5']))
      $name=$_POST['n1'];
      $email=$_POST['n2'];
      $user=$_POST['n3'];
      $password=$_POST['n4'];
      $host="localhost";
      $servername="root";
      $serverpassword="";
      $dbname="System";
$conn=mysqli_connect($host,$servername,$serverpassword,$dbname);
      if($conn)
            if(strlen($name)>=40)
            echo "Your full name will be less than 40 charcters"."<br>";
      if(!preg_match('/^([a-z]+[0-9]*)@([a-z]+)\.[a-z]{2,5}$/', $email))
             {
             echo"Please Enter Valid Email Address"."<br>";
     if(!preg_match('/^[A-Z]{6}+[0-9]{4}+[A-Z]{1}$/', $user))
             echo"Invalid User Name:"."<br>";
                  if(strlen($password)<=8)
     echo" Invalid Password:Password must be more than 8 characters";
     else{
            $sql="insert into
Record(Full_Name,Email,User_Name,Password)values('$name',
'$email','$user','$password')";
                  $result=mysqli_query($conn,$sql);
                  if($result) {
                        echo "Inserted Sucessifully";
}
else
            die(mysqli_error($conn));
       mysqli_close($conn);
?>