<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "testdb";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";

     $fullname = $_POST['fullname'];
     $email = $_POST['email'];
     $password = $_POST['password'];
     $id;
     echo($email);

//$sql = "INSERT INTO persons (fullname, email, password)
//VALUES ('$fullname', '$email', '$password')";

$sql = "SELECT email FROM persons";
$result = $conn->query($sql);

        if ($result->num_rows > 0) {
             while($row = $result->fetch_assoc()) {
        echo "id: " . $row["email"]. "<br>";
    }
        }
else {
    echo "0 results";
}

if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>