(PHP 7)
IntlChar::foldCase — Perform case folding on a code point
$codepoint
[, int $options = IntlChar::FOLD_CASE_DEFAULT
] ) : mixedThe given character is mapped to its case folding equivalent; if the character has no case folding equivalent, the character itself is returned.
Returns the Simple_Case_Folding of the code point, if any; otherwise the code point itself.