Converse one star PHP mb_convert_encoding get string encoding type implementation code

Later in the manual found the Is_utf8 function, so that, combined with the ICONV function, my problem is solved. This function is shown below:

Copy the Code code as follows:

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);
}//Function Is_utf8

If you want to delve into it, it's recommended to look at the section "multibyte String Functions" on the PHP manual.

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