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Which feature allows us to call more than one method or function of the class in single instruction?

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Which feature allows us to call more than one method or function of the class in single instruction?

(a) Typecasting

(b) Method Including

(c) Method adding

(d) Method chaining

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Question is from Advanced Object-Oriented PHP topic in division Object-Oriented PHP of PHP

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Right option is (d) Method chaining

To elaborate: When many methods are called in a single instruction in PHP, it is called method chaining. Following is a basic example of method chaining in php:

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