(PHP 7, PHP 8)
IntlChar::foldCase — Perform case folding on a code point
$codepoint, int $options = IntlChar::FOLD_CASE_DEFAULT): int|string|nullThe given character is mapped to its case folding equivalent; if the character has no case folding equivalent, the character itself is returned.
codepointThe int codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")
options
Either IntlChar::FOLD_CASE_DEFAULT (default)
or IntlChar::FOLD_CASE_EXCLUDE_SPECIAL_I.
Returns the Simple_Case_Folding of the code point, if any; otherwise the code point itself on success,
or null on failure.