PHP: how to randomize an array element after 3 seconds?

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PHP

Here is the question.


Q.AN ARRAY HAS SOME WORDS IN IT,WHICH ARE DISPLAYED RANDOMLY ON SCREEN FOR FEW SECS. THEN USER SEES THAT WORD AND TRIES TO TYPE SAME WORD ON SCREEN. IF USER TYPES SAME WORD WHICH IS ON SCREEN THEN THAT WORD IS DELETED FROM ARRAY. THIS SHOULD WORK UNLESS ARRAY IS EMPTY.

I am not able to understand how to randomize array elements so that one element s displayed at once.
Please can someone provide me with a solution?

Thanks in advance.

Important:
1. I have to use only php, NO JAVASCRIPT
2. I have to take input using POST.
3. The input and output should be on the same page.