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Language/Type: PHP string return

Write a function named crazy_caps that accepts a string as a parameter and returns a new string with its capitalization altered such that the characters at even indexes are all in lowercase and odd indexes are all in uppercase. For example, if a variable s stores "Hey!! THERE!", the call of crazy_caps(s); should return "hEy!! tHeRe!".

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

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