PHP gets the character length of the UTF8 string

PHP gets the character length of the UTF8 string, excerpted from the famous WordPress, very precise oh, it is also important to note that this function only applies to UTF-8 encoding strings.

function Utf8_strlen ($string) {
$string =trim ($string);
if (empty ($string)) return 0;
    To decompose a string into a cell
    Preg_match_all ("/./us", $string, $match);
    Returns the number of units   
    return count ($match [0]);
}

In addition, for gbk/gb2312 encoded strings, directly using PHP's own functions such as strlen (), Mb_strlen () on the line.

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