Description:
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It would be very helpful if PHP had native Mersenne Twister equivalents for all the various random functions, e.g. mt_shuffle, mt_array_rand.  (I'm not sure if there's any others that would be relevant.)  The MT RNG is superior to the regular srand/rand functions in all respects except this one.  While it's not that hard to implement mt_shuffle and mt_array_rand equivalents in PHP, they would be faster and more standardized if they were native.

(On a related note, it would also be helpful if PHP had a native class for creating separate RNG pools, since sometimes you want to be able to recreate a random sequence from a given seed, but since all mt_rand calls use the same RNG pool, you can't have two concurrent RNG pools.)