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count_unique

Language/Type: PHP if/else parameters return

Write a function named count_unique that takes three integers as parameters and that returns the number of unique integers among the three. For example, the call count_unique(18, 3, 4) should return 3 because the parameters have 3 different values. By contrast, the call count_unique(6, 7, 6) should return 2 because there are only 2 unique numbers among the three parameters: 6 and 7.

Function: Write a PHP function as described, not a complete program.

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