Add register page

register.php

+<?php
+	include('conn.php');
+	session_start();
+	function check_input($data) {
+		$data = trim($data);
+		$data = stripslashes($data);
+		$data = htmlspecialchars($data);
+		return $data;
+	}
+	
+	if ($_SERVER["REQUEST_METHOD"] == "POST") {
+		$username=check_input($_POST['username']);
+		
+		if (!preg_match("/^[a-zA-Z0-9_]*$/",$username)) {
+			$_SESSION['sign_msg'] = "Username should not contain space and special characters!"; 
+			header('location: signup.php');
+		}
+		else{
+			
+		$fusername=$username;
+		
+		$password = check_input($_POST["password"]);
+		$fpassword=md5($password);
+		$fname = check_input($_POST["name"]);
+		
+		mysqli_query($conn,"insert into `user` (uname, username, password, access) values ('$fname', '$fusername', '$fpassword', '2')");
+		
+		$_SESSION['msg'] = "Sign up successful. You may login now!"; 
+		header('location: index.php');
+		}
+	}
+?>
\ No newline at end of file