php, whats is the different between strtolower and mb_strtolower?
If i want to convert submitted email address, to be converted to lower-case, which one should i use? Is there any email like this : [email protected]
If there are such email, should i still convert the submitted email address to lower case?
The mb_ functions work with Multi-Byte (unicode) strings as well. E-Mail addresses shouldn't be case sensitive - there isn't much reason to convert them to lower.
whats is the different between strtolower and mb_strtolower?
The mb_* functions work with multi-byte string. The manual says:
By contrast to strtolower(), 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as A-umlaut (Ä).
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Is there any email like this : [email protected]
Yes, I suppose there could be email addresses like that. I've found that in general, email addresses are case-insensitive, so I don't bother changing their case.