Description:
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From manual page: http://www.php.net/function.implode#refsect1-function.implode-
parameters
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First this is said about the function implode:

-------
Note:

implode() can, for historical reasons, accept its parameters in either order. 
For consistency with explode(), however, it may be less confusing to use the 
documented order of arguments.
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Then this is said about the first parameter "glue":

-------
glue
Defaults to an empty string. This is not the preferred usage of implode() as 
glue would be the second parameter and thus, the bad prototype would be used.
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What do you want to tell us really? Nothing is ok? Both having glue as the first 
parameter or the second is ok?