PHP Write a matchSSN function Write a function matchSSN($str) that takes a string representing a social security number as a parameter. The function should return true if the SSN is valid, and false if it is not. An SSN consists of 9 digits that are sometimes, but not always, separated by dashes between the 3rd and 4th digits and between the 5th and 6th digits (e.g. 123-45-6789). Use regular expressions in your solution (e.g. preg_match).

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