commented the var_dump

//var_dump
last updat

2/11/14
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test functions

add, sub, multi, div.
addition of function modulas

modulas aded
update with variables

added variable with number values $first = 100
exercise 1 Function II

if/else if not numeric added
2 Validate divide by 0 errors, display error if attempts to divide by 0 are made.

added if else to divide
3 value to messages

assigned variables to more descriptive error messages
exercise 1 &2

deleting echo errors and using return