Home Backend Development PHP Tutorial Check if a string is UTF8 encoded

Check if a string is UTF8 encoded

Jul 25, 2016 am 09:02 AM

Check if a string is UTF8 encoded转载地址: http://blog.qita.in/?post=418
  1. function is_utf8($string){
  2. return preg_match('%^(?:
  3. [x09x0Ax0Dx20-x7E] # ASCII
  4. | [xC2-xDF][x80-xBF] # non-overlong 2-byte
  5. | xE0[xA0-xBF][x80-xBF] # excluding overlongs
  6. | [xE1-xECxEExEF][x80-xBF]{2} # straight 3-byte
  7. | xED[x80-x9F][x80-xBF] # excluding surrogates
  8. | xF0[x90-xBF][x80-xBF]{2} # planes 1-3
  9. | [xF1-xF3][x80-xBF]{3} # planes 4-15
  10. | xF4[x80-x8F][x80-xBF]{2} # plane 16
  11. )*$%xs', $string);
  12. }
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