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array question

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My task is to read a list of values from MySQL, compare it to a list from an array, ignore the values that exist both in the MySQL list and the array list, and select a random value from the remaining array. I've found functinos like array_slice, array_rand, multisort_array, but I can't seem to be able to put together the whole picture. Could anyone point me in the right direction?

Thanks very much,

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http://www.php.net/in_array checks if a value is in an array

http://www.php.net/unset will remove array elements

http://www.php.net/array_rand will return a key at random from the remaining array

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