php insert to mysql

<?php

$vote_yes=$_GET['yes'];
$vote_no=$_GET['no'];
$time=time();

$servername = "localhost";
$username = "bob";
$password = "123456";
$db = "classDB";

$conn = new mysqli($servername, $username, $password, $db);

if ($conn->connect_error){
	die("Connection failed: ". $conn->connect_error);
}

$sql = "insert into votes(yes,no,time)values('$vote_yes','$vote_no','$time')"; 

if ($conn->query($sql) === TRUE) {
	echo "Votes Recorded: Yes = ".$vote_yes." No = ".$vote_no." Time = ".$time;
} else {
	echo "Error: ".$sql."<br>".$conn->error;
}

$conn->close();

?>