image file upload in php

$actual_image_name='';
if($_FILES['upload_file']['size']>0){

$imageName=$_FILES['upload_file']['name'];
// $imageName=$_FILES['upload_file']['name'][$f];
$imageTem_name=$_FILES['upload_file']['tmp_name'];
$imageType=$_FILES['upload_file']['type'];
$imageSize=$_FILES['upload_file']['size'];
$extExp=explode('.',$_FILES['upload_file']['name']);
$extension=$extExp[1];


$image_info = getimagesize($_FILES["upload_file"]["tmp_name"]);
$width=$image_info['0'];
$height=$image_info['1'];


 list($txt, $ext) = explode(".", $imageName);
$actual_image_name = time().substr(str_replace(" ", "_",$txt), 5).".".$ext;
$path = Mage::getBaseDir('media').DS .'blfa_files'. DS . $actual_image_name;
$temname=$_FILES['upload_file']['tmp_name'];
move_uploaded_file($temname,$path);

}