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Language/Type: PHP recursion string

Write a recursive function named is_palindrome that accepts a string parameter and returns true if the string is the same forwards as backwards, and false otherwise, ignoring capitalization. For example, the call of is_palindrome("Madam") should return TRUE, but the call of is_palindrome("I'm a palindrome!") should return FALSE.


  • Do not declare any global variables or any auxiliary data structures.
  • Do not use any loops; you must use recursion.
Function: Write a PHP function as described, not a complete program.

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