Write, test, and debug PHP scripts for the specifications that follow write functions and the code to test them. Parameter: A string containing words that are delimited on the left with spaces and on...

Write, test, and debug PHP scripts for the specifications that follow write functions and the code to test them.

Parameter: A string containing words that are delimited on the left with spaces and on the right with spaces, commas, periods, or question marks. Return value: The three most common words in the string that have more than three letters.