Need Help Understanding this PHP Code

Question

i am aware of the basics like what is a function, a class, a method etc. however i am totally confused on what exactly the below code does to read the image, i read it somewhere

Answer 1

PHP's imagecreate* function return a resource. If you want to send it to the client, you'll have to set the appropriate headers and then send the raw image:

header('Content-Type: image/jpeg');
imagejpeg($img);

See the GD and Image Functions documentation for details.