valid_unicode() WordPress Function

The valid_unicode() function is a built-in Wordpress function that is used to validate a string of unicode characters. This function is useful for ensuring that a string of text is properly formatted and contains only valid unicode characters.

valid_unicode( int $i ) #

function valid_unicode( $i ) {
	return ( 0x9 == $i || 0xa == $i || 0xd == $i ||
			( 0x20 <= $i && $i <= 0xd7ff ) ||
			( 0xe000 <= $i && $i <= 0xfffd ) ||
			( 0x10000 <= $i && $i <= 0x10ffff ) );
}