Detect whether a string is utf8 encoded code under PHP_PHP Tutorial

function is_utf8($string) {
return preg_match('%^(?:
[x09x0Ax0Dx20-x7E] # ASCII
| [xC2-xDF][ x80-xBF]                                                                          
                                                                               xED[x80-x9F] [x80-xBF] # excluding surrogates
| xF0[x90-xBF][x80-xBF]{2} # planes 1-3
|                                                     4-15
| xF4[x80-x8F][x80-xBF]{2} # plane 16
)*$%xs', $string); It's the same, both are right, and both are wrong.
Encoding detection cannot be 100% accurate, this thing can basically meet the requirements.​



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