Description:
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From manual page: http://www.php.net/function.is-array
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misleading 
The post by Xunnamius@DarkGray on 27-Jun-2011 06:31 is confusing testing for an 
array and testing for an associative array. I spent way too much time trying to 
figure out how "return ((array) $arr !== $arr);" could possible test for an 
associative array before I realized it just tests for any array. The name of the 
functions (is_assoc_3 and is_assoc_4) and the context of comparing them to 
functions that do test for associative arrays make it appear that the functions 
do something other than what they do.

I was going to post a note explaining this so someone else wouldn't waste their 
time, but I didn't want to add more clutter to the notes.