String Search

For this PHP code exercise, create a file named string_search.php. This file should contain a function named string_search() which accepts two parameters. The first is the string to search for (needle) and the second is the string to search (haystack).

If needle is not found in haystack, string_search() should return false. If needle is found in haystack, string_search() should return string formatted as Found 'needle' at index x where needle is the first parameter and x is the starting index where needle was found.

For example, if needle were search and haystack were string search, string_search() should return Found 'search' at position 7.

There are a few special cases:

1. If needle is an empty string, string_search() should return false.
2. If needle is found in haystack multiple times, string_search() should return the first index.

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