The difference between self and this keyword in PHP

The differences are as follows:

1. This cannot be used in static member functions, self can;

2. For static member functions/variables For access, it is recommended to use self instead of $this:: or $this->;

3. To access non-static member variables, self cannot be used, only this;

4. This should be used when the object has been instantiated, self does not have this restriction;

5. When used within a non-static member function, self suppresses polymorphic behavior and refers to the function of the current class; and this refers to the calling class's override function (if any).

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