(PHP 5 >= 5.5.0, PHP 7, PECL >= 3.0.0a1)
UConverter::fromUCallback — Default "from" callback function
public UConverter::fromUCallback ( int $reason , string $source , string $codePoint , int &$error ) : mixed
This function is currently not documented; only its argument list is available.
reason
source
codePoint
error
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https://www.php.net/manual/en/uconverter.fromucallback.php