转载地址:
http://blog.qita.in/?post=418
- function is_utf8($string){
- return preg_match('%^(?:
- [x09x0Ax0Dx20-x7E] # ASCII
- | [xC2-xDF][x80-xBF] # non-overlong 2-byte
- | xE0[xA0-xBF][x80-xBF] # excluding overlongs
- | [xE1-xECxEExEF][x80-xBF]{2} # straight 3-byte
- | xED[x80-x9F][x80-xBF] # excluding surrogates
- | xF0[x90-xBF][x80-xBF]{2} # planes 1-3
- | [xF1-xF3][x80-xBF]{3} # planes 4-15
- | xF4[x80-x8F][x80-xBF]{2} # plane 16
- )*$%xs', $string);
- }
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