转载地址:
http://blog.qita.in/?post=418
- function is_utf8($string){
- return preg_match('%^(?:
- [\x09\x0A\x0D\x20-\x7E] # ASCII
- | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
- | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
- | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
- | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
- | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
- | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
- | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
- )*$%xs', $string);
- }
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