PHP - Image Upload Function

FILE 1 : upload.php


<html>
<body>

<!-- Form Area -->
<form enctype="multipart/form-data" action="pro_uploader.php" method="post">
Select Image: <input type="file" name="userfile">
<input type="submit" value="Upload!">
</form>
<!-- Form Area -->

</body>
</html>


FILE 2 : pro_uploader.php


<?php

# Variables
$path = "images/";
$max_size = "200000";

# File
$filename = $_POST['userfile'];

# Control
if (!isset($HTTP_POST_FILES['userfile'])) exit;

if (is_uploaded_file($HTTP_POST_FILES['userfile']['tmp_name'])) {

if ($HTTP_POST_FILES['userfile']['size']>$max_size) {
echo "The File is Too Big. The Max File Size is $max_size KB<br>n";
exit;
}

# Type Control
if (
   ($HTTP_POST_FILES['userfile']['type']=="image/gif")   ||
   ($HTTP_POST_FILES['userfile']['type']=="image/jpg")   ||
   ($HTTP_POST_FILES['userfile']['type']=="image/bmp")   ||
   ($HTTP_POST_FILES['userfile']['type']=="image/png")   ||
   ($HTTP_POST_FILES['userfile']['type']=="image/jpeg")
)
{

# If File Exist
if (file_exists($path . $HTTP_POST_FILES['userfile']['name']))
{
echo "A File With That Name Already Exists!<br>";
exit;
}

$res = copy($HTTP_POST_FILES['userfile']['tmp_name'], $path .

$HTTP_POST_FILES['userfile']['name']);
if (!$res){
echo "Upload Failed!<br>";
exit;
}
else{
echo "Upload Sucessful!<br>";
}

echo "File Name: ".$HTTP_POST_FILES['userfile']['name']."<br>";
echo "File Size: ".$HTTP_POST_FILES['userfile']['size']." bytes<br>";
echo "File Type: ".$HTTP_POST_FILES['userfile']['type']."<br>";
echo "<a href=$path".$HTTP_POST_FILES['userfile']['name'].">View Image</a>";
}
else
{
echo "Wrong File Type<br>";
exit;
}
}

?>