Scope Resolution Operator - PHP - P57
In PHP, the scope resolution operator, or the double colon ::, allows you to access constants, static properties and methods, and overridden properties and methods. If you're accessing, for example, a constant outside of the class, you would append the double colon operator to the instantiated object, or even the class name. If you're accessing the constant or overridden property or method inside of the class, you would use either self or parent. Self is used to access the constant inside the class itself and parent is used to access the inherited constant, or overridden property or method.
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