Bear in mind that sorting is *always* performed when
scandir() is called. String sorting takes O(|s|n log n)
runtime, and this adds to the burden of the server's memory
and processing power.
Therefore, whenever the alphabetical order of the directory
content is unimportant, especially if sorting is to be
performed by another order, or the natural order of the
files on the filesystem is to be utilized, the use of
opendir(), readdir() and closedir() combined is always
preferred to scandir().
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