ZCE Zend Certified Engineer type hinting problem

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What is the best way to ensure that a user-defined function is always passed an object as its single parameter?

1. function myfunction(stdClass $a)

2. function myfunciton($a = stdClass)

3. Use is_object() within the function

4. There is no way to ensure the parameter will be an object

5. function myfunction(Object $a)

Answer: 1.