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.
Parameters
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.
pieces
The array of strings to implode.
Return Values
Returns a string containing a string representation of all the array
elements in the same order, with the glue string between each element.