Patch for bug/feature request 16119

Hi, I have written a patch for the above feature request to implement an array_swap function. array_swap($array, $key1, $key2), where keys can be either index or assoc and array content can be any combination of string, long, array and object. This is my first patch and I am hoping to contribute more to php in the future so if you don't want to use the patch for any reason, I would be grateful for any pointers or comments on the code. Regards Tony Leake

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