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The explode() function has a correlating multibyte-safe function in mb_split().
I don't see a correlating function for implode(). Does this imply that implode is already safe for multibyte strings?
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As the name suggests Implode/implode() method joins array elements with a string segment that works as a glue and similarly Explode/explode() method does the exact opposite i.e. given a string and a delimiter it creates an array of strings separating with the help of the delimiter.
The code is perfectly safe with sane multibyte-encodings like UTF-8 and EUC-TW, but dangerous with broken ones like Shift_JIS, GB*, etc. Rather than going through all the headache and overhead to be safe with these legacy encodings, I would recommend just supporting only UTF-8.
Definition and Usage The implode() function returns a string from the elements of an array. Note: The implode() function accept its parameters in either order. However, for consistency with explode(), you should use the documented order of arguments. Note: The separator parameter of implode() is optional.
A multibyte character is a character composed of sequences of one or more bytes. Each byte sequence represents a single character in the extended character set. Multibyte characters are used in character sets such as Kanji. Wide characters are multilingual character codes that are always 16 bits wide.
As long as your delimiter and the strings in the array contain only well-formed multibyte sequences there should not be any issues.
implode basically is a fancy concatenation operator and I couldn't imagine a scenario where concatenation is not multibyte safe ;)
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