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Language/Type: PHP string return

Write a function named swap_pairs that accepts a string as a parameter and returns a new string such that each pair of adjacent letters will be reversed. If the string has an odd number of letters, the last letter is unchanged. For example, if a string variable s stores "example", the call of swap_pairs(s); should return "xemalpe". If s had been "hello there", the call would produce "ehll ohtree".

Function: Write a PHP function as described, not a complete program.

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