PHP - Import .csv to database

import.php

<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
$mysqli = new mysqli("localhost", "root", "root", "filmDB");
 
// Check connection
if($mysqli === false){
    die("ERROR: Could not connect. " . $mysqli->connect_error);
}
 
// die('<pre>'.print_r($_FILES,true).'</pre>');

// File import
if(isset($_POST['importSubmit'])){
    
    //validate whether uploaded file is a csv file
    $csvMimes = array('text/x-comma-separated-values', 'text/comma-separated-values', 'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel', 'text/plain');
    if(!empty($_FILES['file']['name']) && in_array($_FILES['file']['type'],$csvMimes)){
        if(is_uploaded_file($_FILES['file']['tmp_name'])){
            
            //open uploaded csv file with read only mode
            $csvFile = fopen($_FILES['file']['tmp_name'], 'r');
            
            //skip first line
            fgetcsv($csvFile);
            
            //parse data from csv file line by line
            while(($line = fgetcsv($csvFile)) !== FALSE) {
                $mysqli->query("INSERT INTO films (FilmName, FilmGenre, FilmDateAdded) VALUES ('".$line[0]."','".$line[1]."','".$line[2]."')");
            }
            
            //close opened csv file
            fclose($csvFile);

            $qstring = '?status=succ';

        }
        else {
            $qstring = '?status=err';
        }
    }
    else {
        $qstring = '?status=invalid_file';
    }
}

//redirect to the listing page
header("Location: ../index.html".$qstring);
 
// Close connection
$mysqli->close();
?>

index.html

<!-- Multiple file import -->
<h2>Add lots of films</h2>
<form id="import-film" class="import-film" action="etc/import.php" name="import-film" method="post" enctype="multipart/form-data">
  <div class="form-group">
    <input type="file" name="file" />
  </div>
  <div class="form-group">
    <input type="submit" class="btn" name="importSubmit" value="Import">
  </div>
</form>