I am trying to better understand basic concepts in OOP. What are static and dynamic variables and methods in object-oriented programming? What is, for instance, the difference between using $this vs. double colon (::)?
$this->method_from_an_extended_class().
分享 "Static" and "dynamic" aren't the right descriptions for that.
-> indicates a instance functions or instance data, meaning that the function or data has an implicit $this reference. To put it another way you're referring to the function or variable within a particular object.
:: indicates a class function or class variable. This is very similar to a global function or variable in that there is no implicit $this reference. All instance of that class share that function or variable.
"Dynamic" would be a more accurate description for, say, PHP overloading where you can "dynamically" create variables, for example, using the magic methods __get() and __set() (which are called when you try to access a property that can't be found; you can overload these methods to essentially pretend the requested member exists).
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