PHP - How to pass class to another class method - php

Question

Im trying to pass the verot image editing class to a custom class that I created, but it doesnt seem to work, it doesnt do anything when I try to run it. How do I pass the verot image class to my class?
//Edit.php
//Now I run my class
$process = new ProcessEventLogo();
$process->editEventLogo($event_id,$file_ext,$savepath,new upload(''));
Here is my custom class. I thought by running upload('') to this method, Im passing a copy of the verot upload class that I can access in my custom class method. But when I run it, it doesnt even get past the $mainimg->uploaded path. In fact $mainimg = $fileupload->upload($savefile); returns NULL when I var_dump it. What am I doing wrong?
class ProcessEventLogo {
public function editEventLogo($eventid,$fext,$url,$savepath,$fileupload)
{
//We generate the file name to save this image to
$savefile = $savepath .'event_' .$eventid .'.' .$fext;
//We check to see if the event image is there
$mainimg = $fileupload->upload($savefile);
//We now resize the image
if($mainimg->uploaded)
{
$mainimg->file_overwrite = TRUE;
$mainimg->image_ratio_crop = TRUE;
$mainimg->image_resize = TRUE;
$mainimg->image_x = 50;
$mainimg->image_y = 50;
$mainimg->process($savefile);
if($mainimg->processed)
{
echo $mainimg->error;
}
}
}

Answer 1

It appears this worked, can someone verify this is the proper way of doing this? So instead of this line:
//We check to see if the event image is there
$mainimg = $fileupload->upload($savefile);
This worked.
//We check to see if the event image is there
$mainimg = new $fileupload($savefile);

Answer 2

#mr.void Right, so how else would I pass this class to my custom class
method? Just seems like this is the wrong way
I think writing a little Factory is the right way for this:
class uploadFac {
public function getUploadInstance($file)
{
return new upload($file)
}
}
And use it like this:
$uplFac = new uploadFac();
$process = new ProcessEventLogo();
$process->editEventLogo($event_id,$file_ext,$savepath,$uplFac);
and in the method:
public function editEventLogo($eventid,$fext,$url,$savepath,$uplFac)
{
//We generate the file name to save this image to
$savefile = $savepath .'event_' .$eventid .'.' .$fext;
$mainimg = $uplFac->getUploadInstance($savefile);