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PHP Interview Questions and Answers

Ques 6. Are objects passed by value or by reference?

Everything is passed by value.

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Ques 7. How do you call a constructor for a parent class?

parent::constructor($value)

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Ques 8. What's the special meaning of __sleep and __wakeup?

__sleep returns the array of all the variables than need to be saved, while __wakeup retrieves them.

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Ques 9. Why doesn't the following code print the newline properly?                 $str = 'Hello, there.nHow are you?
            print $str;
    ?>


Because inside the single quotes the n character is not interpreted as newline, just as a sequence of two characters - and n.

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Ques 10. Would you initialize your strings with single quotes or double quotes?

Since the data inside the single-quoted string is not parsed for variable substitution, it's always a better idea speed-wise to initialize a string with single quotes, unless you specifically need variable substitution.

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