function isValidEmail($mail){

		if (!isset($mail)){
			return false;
		}

		if ($mail==""){
			return false;
		}

		if (substr_count($mail,"@")!=1){
			return false;
		}
		if (substr_count($mail, ".")==0){
			return false;
		}
		if (strripos($mail, "@")>strripos($mail, ".")){
			return false;
		}
		if (strripos($mail, ".")==strlen($mail)-1){
			return false;
		}


		return true;
	}

	function isValidUserName($name){
		if (!isset($name)){
			return false;
		}

		if ($name==""){
			return false;
		}

		if (substr_count($name," ")!=0){
			return false;
		}

		for ($i=0; $i<10; $i++){
			if (substr_compare($name, strval($i), 0, 1)==0){
				return false;
			}
		}
		return true;

	}

	function InsertUser(){
		$ANSWERXML = "<response><Code>";
		$flag=true;
		global $con;
		if(!(is_null($_POST['uname']) || is_null($_POST['uemail']) || is_null($_POST['upass1']) || is_null($_POST['upass2']))){

			$name = $_POST['uname'];
			$mail = $_POST['uemail'];
			$pass1 = $_POST['upass1'];
			$pass2 = $_POST['upass2'];

		while (1==1){
			if (!isValidEmail($mail)){
				$ANSWERXML = $ANSWERXML."1</Code><Desc> Invalid Email </Desc>";
				$flag = false;
				break;
			}

			$get_email = "select * from users_table where email='$mail'";
			$run_email = mysqli_query($con, $get_email);
			$check = mysqli_num_rows($run_email);
			if ($check!=0){
				$ANSWERXML = $ANSWERXML."2</Code><Desc> Email already registered </Desc>";
				$flag =  false;
				break;
			}


			if (!isValidUserName($name)){
				$ANSWERXML = $ANSWERXML."3</Code><Desc> Invalid Username </Desc>";
				$flag = false;
				break;
			}

			$get_name = "select * from users_table where username='$name'";
			$run_name = mysqli_query($con, $get_name);
			$check = mysqli_num_rows($run_name);
			if ($check!=0){
				$ANSWERXML = $ANSWERXML."5</Code><Desc> Username already registered </Desc>";
				$flag = false;
				break;
			}


			if ($name=="" || $mail=="" || $pass1=="" || $pass2==""){
				$ANSWERXML = $ANSWERXML."6</Code><Desc> Fiels left blank </Desc>";
				$flag = false;
				break;
			}
			if ($pass1!=$pass2){
				$ANSWERXML = $ANSWERXML."4</Code><Desc> Not matching passwords </Desc>";
				$flag = false;
				break;
			}

			$register_query = "insert into users_table (username, password, email) values ('$name', '$pass1', '$mail')";
			$run_registration = mysqli_query($con, $register_query);
			$flag = true;
			break;
		}
		}else{
			echo"<p>not isset</p>";
			$flag = false;
		}
		if ($flag==true){
			$ANSWERXML = $ANSWERXML."0</Code><Desc> OK </Desc></responce>";
		}else{
			$ANSWERXML = $ANSWERXML."</responce>";
		}
		echo htmlentities( $ANSWERXML);
		return $flag;

	}

	InsertUser();