Description:
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string chunk_split ( string body [, int chunklen [, string end]])

chunk_split() inserts end to the end of the string too, if the last chunk is long exactly as chunklen.
Following the definition, this is expected:
(quoted from the function page):
"It inserts end (defaults to "\r\n") every chunklen characters"

BUT, this can be unuseful for some procedures. I'm not sure if this behavior was expected by you or if is a bug/mistake.

Reproduce code:
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$string="00001111";
$splitted=chunk_split($string,4," ");
echo $splitted;

Expected result:
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echo $splitted returns "0000 1111 " (without the " and WITH the ending space. I expected "0000 1111" (without the ending space and without the " )

Actual result:
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Actually I reach my expected result adding:
$splitted=rtrim($splitted);
before echoing...