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

In HTML, all you need to do is refer to the file in an tag.

The source needs to be the URL of the image, relative to your webserver root directory.

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As for the code, you put up. That would be completely unnecessary for HTML usage, and is also unnecessary for standard image use within PHP, as there are direct methods to load an image from a file, imagecreatefromjpeg() for instance for JPEG files.

As it stands, the constructor of your Image class takes a filename, opens that file and reads the entire contents as binary data in to the string $buf, 4096 bytes at a time. Then it calls imagecreatefromstring($buf) to convert the file data in to an image resource, which can then be used further within PHP with the PHP GD image handling functions.

As I say, none of this is particularly relevant if all you wish to do is display an existing image within HTML. Those commands are designed for image manipulation, inspection and creation.