I am developing a website, where I am allowing users to upload videos, but if the members numbers keep on increasing and they keep on uploading more videos it will be expensive for me. So I want to upload the movies to youtube instead, is this possible?
By viewing some other posts here, I am thinking it is possible?
You need Youtube API to upload the videos with PHP.
There are some ready scripts you can use to upload to youtube, the one that deserves mention here is:
More Resources
In addition to Sarfraz's links you also have the Services_YouTube PEAR package and the Zend_Gdata_YouTube class. They are both very well documented.