PHP: Differences in >self, $this operators

PHP: The difference between:,-, self, $this operator

When accessing a member variable or method in a PHP class, if the referenced variable or method is declared as const (defining a constant) or static (declaring static), then the operator must be used::, conversely, if the referenced variable or method is not declared as const or static, Then you must use the operator---.

In addition, if you access a const or static variable or method from within a class, you must use self-referencing, and conversely, if accessing from within a class is not a const or static variable or method, you must use a self-referencing $this.

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