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Sorts an array by key, maintaining key to data correlations. This is useful mainly for associative arrays.
Returnerar TRUE vid framg�ng eller FALSE vid fel.
You may modify the behavior of the sort using the optional parameter sort_flags, for details see sort().
See also asort(), arsort(), krsort(), uksort(), sort(), natsort(), and rsort().
Not: The second parameter was added in PHP 4.
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