Object Oriented Concept MCQ question and answer with solution | PHP Programming

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1.
Which one of the following is not a valid class name?

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2.
Fill in the blank with the best option. An Object is a/an ________ of a class.

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3.
Which version of PHP introduced the visibility keywords i.e public, private, and protected?

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4.
Which characters is used to access property variables on an object-by-object basis?

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