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random generation script prob


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Hi I wrote up a simple random generation script quickly which works as intended, however as is common I have ran into a little problem, here's the code:

<?php$blogs_array = array('<li><a href="url">site1</a></li>','<li><a href="url">site2</a></li>','<li><a href="url">site3</a></li>');shuffle ($blogs_array);?><?php for ($i = 0; $i < 3; $i++) {		echo "$blogs_array[$i]";}?>

I've replaced the array urls with just url for privacy.My problem is that with the script running, the same link can appear twice, is there a way to prevent an entry from appearing more than once?

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