include resize_image php define maxim size for the uploaded images in

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<?
include 'resize_image.php';
//define a maxim size for the uploaded images in Kb
define ("MAX_SIZE","50");
//This function reads the extension of the file. It is used to determine if the file is an image by checking the extension.
function getExtension($str) {
$i = strrpos($str,".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}
//This variable is used as a flag. The value is initialized with 0 (meaning no error found)
//and it will be changed to 1 if an errro occures.
//If the error occures the file will not be uploaded.
$errors=0;
//checks if the form has been submitted
if(isset($_POST['Submit']))
{
//reads the name of the file the user submitted for uploading
$image=$_FILES['image']['name'];
//if it is not empty
if ($image)
{
//get the original name of the file from the clients machine
$filename = stripslashes($_FILES['image']['name']);
//get the extension of the file in a lower case format
$extension = getExtension($filename);
$extension = strtolower($extension);
//if it is not a known extension, we will suppose it is an error and will not upload the file,
//otherwise we will do more tests
if (($extension != "jpg") && ($extension != "jpeg"))
{
//print error message
echo '<p class="red">Разрешены только изображения формата *.jpeg и *.jpg!</p>';
$errors=1;
}
else
{
//get the size of the image in bytes
//$_FILES['image']['tmp_name'] is the temporary filename of the file
//in which the uploaded file was stored on the server
$size=filesize($_FILES['image']['tmp_name']);
//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
{
echo '<p class="red">Вес фото не должен превишать 50Кб!</p>';
$errors=1;
}
$iname=$GLOBALS['mem_profile']['user_id'];
//we will give an unique name, for example the time in unix time format
//$image_name='user_photo-'.$iname.'.'.$extension;
$image_name='user_photo-'.$iname.'.jpg';
$image_name2='user_photo-'.$iname.'_th.jpg';
//the new name will be containing the full path where will be stored (images folder)
$newname="images/photos/".$image_name;
$newname2="images/photos/".$image_name2;
$obj_img = new thumbnail_images();
$obj_img->PathImgOld = $_FILES['image']['tmp_name'];
$obj_img->PathImgNew = $newname;
$obj_img->NewWidth = 210;
$obj_img->NewHeight = 280;
$result = $obj_img->create_thumbnail_images();
$obj_img = new thumbnail_images();
$obj_img->PathImgOld = $_FILES['image']['tmp_name'];
$obj_img->PathImgNew = $newname2;
$obj_img->NewWidth = 140;
$obj_img->NewHeight = 187;
$result = $obj_img->create_thumbnail_images();
if (!$result)
{
echo '<p class="red">Сохранение невозможно!</p>';
$errors=1;
}}}}
//If no errors registred, print the success message
if(isset($_POST['Submit']) && !$errors)
{
echo "<p><strong>Фото успешно изменено</strong></p>";
}
?>