<?php
$servername = "server name dbnya (biasanya localhost)";
$username = "username dbnya";
$password = "passwordnya";
$dbname = "nama db nya";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
if(!empty($_POST['name']) && !empty($_POST['email']) && !empty($_POST['comment'])){
    $name = $_POST['name'];
    $email = strlower($_POST['email']);
    $comment = $_POST['comment'];

    // bagian mysql nya kurang jelas. karna gk ada connect nya. coba kamu pake Medoo Framework Mysql.
    /* contoh mysql */

// Check connection


$sql = "INSERT INTO `nama tablenya` (comment, email)
VALUES ($comment, $email)";

if (mysqli_query($conn, $sql)) {
    echo "comment baru terbuat";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}

}
$sql = "SELECT comment, email FROM `nama_data_comment`";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "$row['email']<br>$row['comment']<br><br>";
    }
} else {
    echo "0 komen";
}