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Instructions Write a php program that implements the following procedures from class: alua- ces Coctor add o your function should be named "add" and should add two numbers together o it must be able to handle negative numbers o use the algorithm from class subtract o again, name it "subtract" o it must be able to handle negative numbers o use the algorithm from class mult o named "mult" o must handle negative numbers o must use the algorithm from class exponential o named "exponential" o only handle positive exponents, but handle negative bases. o must use the algorithm from class At the very end of your file, add the wing code, to make sure everything works: 1 2 echo " 6 + 5." echo " 0 + 2 echo " 8 + -4 -" add(6,5); add(0,2); .add(8,-4); echo " 6 -5 = " echo " 6 -2 -" echo " 8 4 = subtract(6,5); subtract(0,2); .subtract(8,-4); 4 5 6 7 8 9 10 11 12 13 14 echo " 6 + 5 = " mult(6,5); echo " 0 + 2 = " mult(0,2); echo " 8 * -4 = " , mult(8,-4); echo " 2 AA 5" exponential(2,5); echo " -2 15 - " . exponential(-2,5)