PHP, load EXCEL/CSV file to mysql

Excel files can be saved as csv  format first.
1. First Create a database and table to match columns in csv, for example: first column name, then email and phone
CREATE DATABASE IF NOT EXISTS mydatabase;
USE mydatabase;
DROP TABLE IF EXISTS `user`;
CREATE TABLE user
(
    name VARCHAR(50)      NOT NULL DEFAULT '',
    email VARCHAR(50) NOT NULL DEFAULT '',
    phone int(11),
    PRIMARY KEY (`email`)
)ENGINE=InnoDB  DEFAULT CHARSET=utf8;

PHP script
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
$db_host = 'localhost';
$db_user = 'root';
$db_pwd = 'mypasswd';

$database = 'mydatabase';
$table = 'user';

if (!mysql_connect($db_host, $db_user, $db_pwd))
    die("Can't connect to database");

if (!mysql_select_db($database))
    die("Can't select database");


    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");
      
             while (($data = fgetcsv($handle, 1000, ",")) !== FALSE)
             {
                $sql = "INSERT into user(name,email,phone) values('$data[0]','$data[1]','$data[2]')";
                mysql_query($sql) or die(mysql_error());
             }
      
             fclose($handle);
             echo "Successfully Imported";
           
         }
         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>