mirko mirko - 3 years ago 2364
PHP Question

unicode characters (like emoticons) in telegram bot message (or keyboard)

I'm playing with Telegram bot development.
The only thing in which i have no success is sending unicode characters.

The way i call the "sendMessage" api is in php with curl:

curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, array("chat_id" => $chat_id, "text" => "\u2b50"));


The code above should post a star icon on the chat, but instead shows the exact text:


\u2b50



  • Escaping the text ("\\u2b50") doesn't work.

  • If the bot acts as an echo (replies with the received text) when typing "\u2b50" in the client, it replies with the star icon.

  • same behavior has for the keyboard keys (reply_markup.keyboard)



Thanks in advance

EDIT:
solved with solution from bobince (thanks!).

used inline function like:

$text = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', function ($match) {
return iconv('UCS-4LE', 'UTF-8', pack('V', hexdec($match[1])));
}, $text);


or

$text = preg_replace("/\\\\u([0-9a-fA-F]{4})/e", "iconv('UCS-4LE','UTF-8',pack('V', hexdec('U$1')))", $text);

Answer Source

"\u2b50"

PHP string literal syntax doesn't have \u escapes, primarily because PHP strings are not Unicode-based, they're just a list of bytes.

Consequently if you want to include a non-ASCII character in a string you need to encode the character to bytes using whatever encoding the consumer of your output will be expecting.

If the Telegram web service is expecting to receive UTF-8 (and I've no idea if it is, but it's a good guess for any modern web app), then the UTF-8-encoded bytes for U+2B50 are 0xE2, 0xAD and 0x90, and so the string literal you should use is:

"\xE2\xAD\x90"

If you want to convert a Unicode codepoint to a UTF-8 string more generally:

function unichr($i) {
    return iconv('UCS-4LE', 'UTF-8', pack('V', $i));
}

unichr(0x2B50)   // "\xE2\xAD\x90"
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