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Language/Type: PHP string parameters return Boolean

Write a function named is_palindrome that accepts a string parameter and returns true if that string is a palindrome, or false if it is not a palindrome.

For this problem, a palindrome is defined as a string that contains exactly the same sequence of characters forwards as backwards, case-insensitively. For example, "madam" or "racecar" are palindromes, so the call of is_palindrome("racecar") would return true. Spaces, punctuation, and any other characters should be treated the same as letters; so a multi-word string such as "dog god" could be a palindrome, as could a gibberish string such as "123 $ 321". The empty string and all one-character strings are palindromes by our definition. Your code should ignore case, so a string like "Madam" or "RACEcar" would also count as palindromes.

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

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