(PHP 4 >= 4.3.0, PHP 5, PHP 7)
Perform case folding on a string
string mb_convert_case ( string $str, int $mode [, string $encoding = mb_internal_encoding() ] )
Performs case folding on a string, converted in the way specified by mode.
Parameters:
str
The string being converted.
mode
The mode of the conversion. It can be one of MB_C