PHP获取汉字首字母函数

function getFirstCharter($str){ ???if (empty($str)) { ???????return ‘‘; ???} ???????$fchar = ord($str{0}); ???????if ($fchar >= ord(‘A‘) && $fchar <= ord(‘z‘)) ???????return strtoupper($str{0}); ???????$s1 = iconv(‘UTF-8‘, ‘gb2312‘, $str); ???????$s2 = iconv(‘gb2312‘, ‘UTF-8‘, $s1); ???????$s = $s2 == $str ? $s1 : $str; ???????$asc = ord($s{0}) * 256 + ord($s{1}) - 65536; ???????if ($asc >= -20319 && $asc <= -20284) ???????return ‘A‘; ???????if ($asc >= -20283 && $asc <= -19776) ???????return ‘B‘; ???????if ($asc >= -19775 && $asc <= -19219) ???????return ‘C‘; ???????if ($asc >= -19218 && $asc <= -18711) ???????return ‘D‘; ???????if ($asc >= -18710 && $asc <= -18527) ???????return ‘E‘; ???????if ($asc >= -18526 && $asc <= -18240) ???????return ‘F‘; ???????if ($asc >= -18239 && $asc <= -17923) ???????return ‘G‘; ???????if ($asc >= -17922 && $asc <= -17418) ???????return ‘H‘; ???????if ($asc >= -17417 && $asc <= -16475) ???????return ‘J‘; ???????if ($asc >= -16474 && $asc <= -16213) ???????return ‘K‘; ???????if ($asc >= -16212 && $asc <= -15641) ???????return ‘L‘; ???????if ($asc >= -15640 && $asc <= -15166) ???????return ‘M‘; ???????if ($asc >= -15165 && $asc <= -14923) ???????return ‘N‘; ???????if ($asc >= -14922 && $asc <= -14915) ???????return ‘O‘; ???????if ($asc >= -14914 && $asc <= -14631) ???????return ‘P‘; ???????if ($asc >= -14630 && $asc <= -14150) ???????return ‘Q‘; ???????if ($asc >= -14149 && $asc <= -14091) ???????return ‘R‘; ???????if ($asc >= -14090 && $asc <= -13319) ???????return ‘S‘; ???????if ($asc >= -13318 && $asc <= -12839) ???????return ‘T‘; ???????if ($asc >= -12838 && $asc <= -12557) ???????return ‘W‘; ???????if ($asc >= -12556 && $asc <= -11848) ???????return ‘X‘; ???????if ($asc >= -11847 && $asc <= -11056) ???????return ‘Y‘; ???????if ($asc >= -11055 && $asc <= -10247) ???????return ‘Z‘; ???????return null; ???}$firstChar = getFirstCharter(‘你好‘);print_r($firstChar);