<?php
header('Content-Type: text/html; charset=utf-8');
$servername = "localhost";
$username = "root";
$password = "abc";
$dbname = "project";

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

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$sql = "TRUNCATE TABLE datapack";
mysqli_query($conn,$sql);

if(isset($_POST['submit']))
{
     $fname = $_FILES['sel_file']['name'];
     echo 'upload file name: '.$fname.' ';
     $chk_ext = explode(".",$fname);

     if(strtolower(end($chk_ext)) == "csv")
     {
         $filename = $_FILES['sel_file']['tmp_name'];
         $handle = fopen($filename, "r");
         $head = fgetcsv($handle);
         while (($data = fgetcsv($handle, 1000, ",")) !== FALSE)
         {
            $sql= "INSERT into datapack(id,nickname,time,msg) values('$data[0]','$data[1]','$data[2]','$data[3]')";
            mysqli_query($conn,$sql);
            echo "Error: ". $conn->error;
          }
        echo "Success!";
     }

     else
     {
         echo "Invalid File";
     }
}

?>
<h1>Import CSV file</h1>
<form action='<?php echo $_SERVER["PHP_SELF"];?>' method='post' enctype="multipart/form-data">
    Import File : <input type='file' name='sel_file' size='20'>
    <input type='submit' name='submit' value='submit'>
</form>