Symbols used in classes.

Hi all.,
Probably an old quesion, but im pretty new to php, and have not had
great success in searching.

Ive looking over some code which contains the following terms

$this
->
::

And have not clue as to what they mean. I have been looking at the php
documentation for classes and they appear there, but they are not well
explained. Can someone point me a good resource for explaining these,
or post me some explaination.s

Many thanks.
.

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