Importar e exportar arquivos CSV em PHP

Aqui está o arquivo function.php para importar e exportar CSV do PHP em seu site

<?php
 if(isset($_POST["Import"])){

    $filename=$_FILES["file"]["tmp_name"];    
     if($_FILES["file"]["size"] > 0)
     {
        $file = fopen($filename, "r");
          while (($getData = fgetcsv($file, 10000, ",")) !== FALSE)
           {
             $sql = "INSERT into employeeinfo (emp_id,firstname,lastname,email,reg_date) 
                   values ('".$getData[0]."','".$getData[1]."','".$getData[2]."','".$getData[3]."','".$getData[4]."')";
                   $result = mysqli_query($con, $sql);
        if(!isset($result))
        {
          echo "<script type="text/javascript"">
              alert(""Invalid File:Please Upload CSV File."");
              window.location = ""index.php""
              </script>"";    
        }
        else {
            echo ""<script type=""text/javascript"">
            alert(""CSV File has been successfully Imported."");
            window.location = ""index.php""
          </script>"";
        }
           }

           fclose($file);  
     }
  }   
 ?>

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