'Reliable' SMS Unicode & GSM Encoding in PHP

Question

(Updated a little)

I\'m not very experienced with internationalization using PHP, it must be said, and a deal of searching didn\'t really provide th

Answer 1

preg_match('/^[\x0A\x0C\x0D\x20-\x5F\x61-\x7E\xA0\xA1\xA3-\xA5\xA7'.
    '\xBF\xC4-\xC6\xC9\xD1\xD6\xD8\xDC\xDF\xE0\xE4-\xE9\xEC\xF1'.
    '\xF2\xF6\xF8\xF9\xFC'.
    json_decode('"\u0393\u0394\u0398\u039B\u039E\u03A0\u03A3\u03A6\u03A8\u03A9\u20AC"').
    ']*$/u', $text)

or

preg_match('/^[\x0A\x0C\x0D\x20-\x5F\x61-\x7E\xA0\xA1\xA3-\xA5\xA7\xBF\xC4-\xC6\xC9\xD1\xD6\xD8\xDC\xDF\xE0\xE4-\xE9\xEC\xF1\xF2\xF6\xF8\xF9\xFCΓΔΘΛΞΠΣΦΨΩ€]*$/u', $text)