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Language/Type: PHP string return

Write a function named reverse_chunks that accepts a string s and integer k as parameters and returns a new string that reverses the relative order of every k characters of s. For example, the call of reverse_chunks("MehranSahami", 3) should view the string in groups of 3 characters at a time, reversing "Meh" into "heM", and "ran" into "nar", and so on, returning a result of "heMnarhaSima".

If the string's length is not an exact multiple of k, the last chunk of fewer-than-k characters at the end of the string should be left in its original order. For example, if the call is reverse_chunks("MartyStepp", 4), the first chunk "Mart" becomes "traM" and the second chunk "ySte" becomes "etSy". The last two characters, "pp", are fewer than 4, so they are left as-is. So the result returned should be "traMetSypp".

You may assume that the value passed for k will be a positive integer.


  • Do not use any data structures such as arrays to help you solve this problem.
  • You may declare as many simple variables like Integer, String, etc. as you like.

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

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