Description:
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The function array_push returns the count of the array after the new element/s is/are pushed onto it. However it would be rather useful to have the key of the first pushed value returned. Until now I have to rely on a rather slow user function to do the same.
Of course it makes no sense to modify the function, because some may need it to return the element count. However I think it would be very handy to be able to access the elements after pushing them onto the stack, therefore I wonder whether you could create a built in function to do so.

PS: I was not allowed to pick irrelevant for PHP version, so I picked 5.0.4 since I'm currently developing for PHP5 only. The funtion would be great for PHP4 too, though.
PPS: I hope I did not overlook an already existing function..

Sincerely,
Benjamin Schulz