Description:
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From manual page: http://www.php.net/function.ksort#Examples
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The example would be clearer if the first letter of each array value matched the corresponding array key, like so:

$fruits = array("l"=>"lemon", "c"=>"cranberry", "a"=>"apple", "b"=>"banana");

Then, when the output is shown, the reader can easily see that key => value mappings are preserved:

a = apple
b = banana
c = cranberry
l = lemon