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- function detectUTF8($string)
- {
- return preg_match('%(?:
- [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
- |\xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
- |[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
- |\xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
- |\xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
- |[\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
- |\xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
- )+%xs', $string);
- }
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