function get_flag($country_code) {
    $code = strtoupper(trim($country_code));
    $code = preg_replace('/[^A-Z]/', '', $code);
    if (strlen($code) !== 2) return '';

    // base = 0x1F1E6 - ord('A') = 127462 - 65 = 127397
    $base = 127397;
    $out = '';
    for ($i = 0; $i < 2; $i++) {
        $out .= mb_convert_encoding(
            '&#' . (ord($code[$i]) + $base) . ';',
            'UTF-8',
            'HTML-ENTITIES'
        );
    }
    return $out;
}

🧪 Misol:
echo get_flag('uz'); // 🇺🇿
echo get_flag('us'); // 🇺🇸
echo get_flag('ru'); // 🇷🇺

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