Why are the PHP multi-byte string functions (the ones which start with mb_) not used by default in PHP?
Why are the PHP multi-byte string functions (the ones which start with mb_ )
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Why are the PHP multi-byte string functions (the ones which start with mb_) not used by default in PHP?
Backwards compatibility. Old PHP scripts depend on non-multibyte functionality.
See also: http://www.php.net/manual/en/mbstring.overload.php