Can I use an abstract class instead of a private __construct() when creating a singleton in PHP?

When creating a singleton in PHP, declaring the construct and clone as private ensures that the class cannot be instanciated from the outside : it can still be instanciated from inside its declaration.

No because then then you can't instantiate the class at all (not even in the static getInstance method). The private constructor in the singleton example just assures, that only the static getInstance method from the same class can access the constructor.

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