WP_HTML_Decoder::code_point_to_utf8_bytes( int $code_point ): string

426	public static function code_point_to_utf8_bytes( $code_point ): string {427		// Pre-check to ensure a valid code point.428		if (429			$code_point <= 0 ||430			( $code_point >= 0xD800 && $code_point <= 0xDFFF ) ||431			$code_point > 0x10FFFF432		) {433			return '�';434		}435 436		if ( $code_point <= 0x7F ) {437			return chr( $code_point );438		}439 440		if ( $code_point <= 0x7FF ) {441			$byte1 = chr( ( $code_point >> 6 ) | 0xC0 );442			$byte2 = chr( $code_point & 0x3F | 0x80 );443 444			return "{$byte1}{$byte2}";445		}446 447		if ( $code_point <= 0xFFFF ) {448			$byte1 = chr( ( $code_point >> 12 ) | 0xE0 );449			$byte2 = chr( ( $code_point >> 6 ) & 0x3F | 0x80 );450			$byte3 = chr( $code_point & 0x3F | 0x80 );451 452			return "{$byte1}{$byte2}{$byte3}";453		}454 455		// Any values above U+10FFFF are eliminated above in the pre-check.456		$byte1 = chr( ( $code_point >> 18 ) | 0xF0 );457		$byte2 = chr( ( $code_point >> 12 ) & 0x3F | 0x80 );458		$byte3 = chr( ( $code_point >> 6 ) & 0x3F | 0x80 );459		$byte4 = chr( $code_point & 0x3F | 0x80 );460 461		return "{$byte1}{$byte2}{$byte3}{$byte4}";462	}