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I came across these pieces of code and have been trying to understand  this operator  ->

Or if it is a operator. I have searched and couldn't find explanations. In trying to learn I need to know what is is used for. Is it used only with classes?

 

$m->myMethod();

 

return  $this->x;

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https://forums.phpfreaks.com/topic/256779-what-are-these-operators/
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It's called the "object operator", and allows you to access methods and properties within an object. Be careful to note the difference between a class and an object here though. I would suggest reading the manual's introduction to them:

 

http://www.php.net/manual/en/language.oop5.basic.php

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