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power

Language/Type: PHP recursion

Write a recursive function named power that accepts two integers representing a base and an exponent and returns the base raised to that exponent. For example, the call of power(3, 4) should return 34 or 81 . If the exponent passed is negative, throw an Exception.

Constraints:

  • Do not declare any global variables.
  • Do not use any loops; you must use recursion.
  • Do not declare the standard PHP pow function in your solution.
  • Do not use any auxiliary data structures (e.g. arrays) or strings to solve this problem.
Function: Write a PHP function as described, not a complete program.

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