Untitled

<!DOCTYPE html>
<html>
<head>
    <title>Untitled</title>
    <meta charset='utf-8'>
    <link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
    <form method='post'>
        <p> Table info</p>
        <input type='text' name='firstname' placeholder='Vardas' pattern='[a-zA-Z]{5,30}'><br>
        <input type='text' name='email' placeholder='Email' pattern='[a-zA-Z0-9]+@[a-zA-Z0-9]+.[a-zA-Z]{2,5}'><br>
        <input type='text' name='message' placeholder='Tekstas' pattern='[a-zA-Z0-9\s]{5,}'><br>
        <button type='submit' name='insert'>Siusti</button><br>
        <input type='text' name='deleteEdit' placeholder='ID' pattern='[0-9]{1,4}'><br>
        <button type='submit' name='edit'>Redaguoti</button>
        <button type='submit' name='delete'>Trinti</button>
        <button type='submit' name='display'>Rodyti duombaze</button>
    </form>
<?php
    $servername = "localhost";
    $username = "root";
    $password = "";
    $dbname = "test";

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);

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

    // Insert

    if (isset($_POST['insert'])) {

      $name = $_POST['firstname'];
      $email = $_POST['email'];
      $text = $_POST['message'];
      $ip = $_SERVER['REMOTE_ADDR'];


         if ((preg_match('/[a-zA-Z]{5,30}/', $name)) and (preg_match('/[a-zA-Z0-9]@[a-zA-Z0-9].[a-zA-Z]{2,5}/', $email)) and (preg_match('/[a-zA-Z0-9\s]{5,}/', $text))) {

            $sql = "INSERT INTO mantas_zukauskas(ip, vardas, epastas, zinute) VALUES('$ip', '$name', '$email', '$text')";
                if ($conn->query($sql) === TRUE) {
            echo "New record created successfully";
                } else {
            echo "Error: " . $sql . "<br>" . $conn->error;
          }
          } else {
            die ("Form filled incorrectly");
          }
        }

    // Delete

    if (isset($_POST['delete'])) {
        $id = $_POST['deleteEdit'];

        $check = mysqli_query($conn, "SELECT * FROM mantas_zukauskas WHERE id = '$id'");

        if (mysqli_num_rows($check) > 0) {
             } else {
            die ("ID does not exist in table");
             }

        if (preg_match('/[0-9]{1,4}/', $id)) {
            $sql ="DELETE FROM mantas_zukauskas WHERE id = '$id'";
            if ($conn->query($sql) === TRUE) {
                echo "Record deleted successfully";
            } else {
                echo "Error: " . $sql . "<br>" . $conn->error;
            }
        } else {
            die ("Error, not deleted");
            }
        }

    // Edit

    if (isset($_POST['edit'])) {

        $id = $_POST['deleteEdit'];
        $name = $_POST['firstname'];
        $email = $_POST['email'];
        $text = $_POST['message'];
        $ip = $_SERVER['REMOTE_ADDR'];


            if ((preg_match('/[a-zA-Z]{5,30}/', $name)) and (preg_match('/[a-zA-Z0-9]@[a-zA-Z0-9].[a-z]{2,5}/', $email)) and (preg_match('/[a-zA-Z0-9\s]{5,}/', $text)) and (preg_match('/[0-9]{1,4}/', $id))) {

                $check = mysqli_query($conn, "SELECT * FROM mantas_zukauskas WHERE id = '$id'");

                if (mysqli_num_rows($check) > 0) {} else {
                    die ("ID does not exist in table");
                }

                $sql = "UPDATE mantas_zukauskas SET vardas ='$name', epastas = '$email', zinute = '$text', ip = '$ip' WHERE id='$id'";

                if ($conn->query($sql) === TRUE) {
                    echo "Record updated successfully";
                } else {
                    echo "Error: " . $sql . "<br>" . $conn->error;
                }
            } else {
                 die ("Form filled incorrectly");
            }
    }

    // Show data on page

    if (isset($_POST['display'])) {

        $id = $_POST['deleteEdit'];
        if ($id == TRUE) {
            $check = mysqli_query($conn, "SELECT * FROM mantas_zukauskas WHERE id = '$id'");
            if ($check->num_rows > 0) {
            } else {
                $check = mysqli_query($conn, "SELECT * FROM mantas_zukauskas");
            }
        } else {
            $check = mysqli_query($conn, "SELECT * FROM mantas_zukauskas");
        }
        if ($check->num_rows > 0) {
            while ($row = $check->fetch_assoc()) {
                echo "ID: " . $row["id"]. " Vardas: " . $row["vardas"]. " E-mail: " . $row["epastas"]. " Zinute: " . $row["zinute"]. "<br>";
            }
        }
    }

$conn->close();

?>
</body>
</html>