What the heck is $function(); and $$variable for?
Have never heard of these before, and searching on google doesn't give anything useful (possible that my keywords aren't perfect).
via https://stackoverflow.com/questions/4891301/top-bad-practices-in-php/4891422#4891422
Answer
$function() is a variable function and $$variable is a variable variable.
Those linked pages should give you plenty to go on, or at the very least some actual words to search with.
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