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Full Discussion: strlen for UTF-8
Top Forums Programming strlen for UTF-8 Post 302414174 by Corona688 on Monday 19th of April 2010 11:29:16 AM
Old 04-19-2010
UTF8 is encoded in 8-bit segments but occasionally it can take more than one byte to encode a full character. So the number of characters is wholly unrelated to the number of characters in the string; changing a #define won't make it any more right. None of the usual strlen/sizeof/etc things apply to a system where character encodings aren't always the same size!

If you want to count the number of UTF-8 encoded characters in the string, as opposed to the physical length of the string in bytes, I once wrote code for a UTF8 getc. Use strlen to get the length of the datablock to feed it, then process UTF8 chars one by one until the end of the string to get the UTF8 char count.
 

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UTF8_ENCODE(3)								 1							    UTF8_ENCODE(3)

utf8_encode - Encodes an ISO-8859-1 string to UTF-8

SYNOPSIS
string utf8_encode (string $data) DESCRIPTION
This function encodes the string $data to UTF-8, and returns the encoded version. UTF-8 is a standard mechanism used by Unicode for encoding wide character values into a byte stream. UTF-8 is transparent to plain ASCII characters, is self-synchronized (meaning it is possible for a program to figure out where in the bytestream characters start) and can be used with normal string comparison functions for sorting and such. PHP encodes UTF-8 characters in up to four bytes, like this: UTF-8 encoding +------+-------------------------------------+---+ |bytes | | | | | | | | | bits | | | | | | | | representation | | | | | | +------+-------------------------------------+---+ | 1 | | | | | | | | | 7 | | | | | | | | 0bbbbbbb | | | | | | | 2 | | | | | | | | | 11 | | | | | | | | 110bbbbb 10bbbbbb | | | | | | | 3 | | | | | | | | | 16 | | | | | | | | 1110bbbb 10bbbbbb 10bbbbbb | | | | | | | 4 | | | | | | | | | 21 | | | | | | | | 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb | | | | | | +------+-------------------------------------+---+ Each b represents a bit that can be used to store character data. PARAMETERS
o $data - An ISO-8859-1 string. RETURN VALUES
Returns the UTF-8 translation of $data. SEE ALSO
utf8_decode(3). PHP Documentation Group UTF8_ENCODE(3)
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