String array PHP detects if the string is UTF8 encoded code

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);
}
Accuracy is basically the same as mb_detect_encoding, to be right together, to be wrong together.
Code detection is not possible 100% accurate, this thing has been able to basically meet the requirements.

The above describes the string array php under the detection string is UTF8 encoded code, including the contents of the string array, I hope to be interested in PHP tutorial friends helpful.

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