php---------取汉字的第一个字的首字母

/** * 取汉字的第一个字的首字母 * @param string $str * @return string|null */function getFirstChar($str) { ???if (empty($str)) { ???????return ‘‘; ???} ???$fir = $fchar = ord($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 : $str; ???if (!isset($s[0]) || !isset($s[1])) { ???????return ‘‘; ???} ???$asc = ord($s[0]) * 256 + ord($s[1]) - 65536; ???if (is_numeric($str)) { ???????return $str; ???} ???if (($asc >= -20319 && $asc <= -20284) || $fir == ‘A‘) { ???????return ‘A‘; ???} ???if (($asc >= -20283 && $asc <= -19776) || $fir == ‘B‘) { ???????return ‘B‘; ???} ???if (($asc >= -19775 && $asc <= -19219) || $fir == ‘C‘) { ???????return ‘C‘; ???} ???if (($asc >= -19218 && $asc <= -18711) || $fir == ‘D‘) { ???????return ‘D‘; ???} ???if (($asc >= -18710 && $asc <= -18527) || $fir == ‘E‘) { ???????return ‘E‘; ???} ???if (($asc >= -18526 && $asc <= -18240) || $fir == ‘F‘) { ???????return ‘F‘; ???} ???if (($asc >= -18239 && $asc <= -17923) || $fir == ‘G‘) { ???????return ‘G‘; ???} ???if (($asc >= -17922 && $asc <= -17418) || $fir == ‘H‘) { ???????return ‘H‘; ???} ???if (($asc >= -17417 && $asc <= -16475) || $fir == ‘J‘) { ???????return ‘J‘; ???} ???if (($asc >= -16474 && $asc <= -16213) || $fir == ‘K‘) { ???????return ‘K‘; ???} ???if (($asc >= -16212 && $asc <= -15641) || $fir == ‘L‘) { ???????return ‘L‘; ???} ???if (($asc >= -15640 && $asc <= -15166) || $fir == ‘M‘) { ???????return ‘M‘; ???} ???if (($asc >= -15165 && $asc <= -14923) || $fir == ‘N‘) { ???????return ‘N‘; ???} ???if (($asc >= -14922 && $asc <= -14915) || $fir == ‘O‘) { ???????return ‘O‘; ???} ???if (($asc >= -14914 && $asc <= -14631) || $fir == ‘P‘) { ???????return ‘P‘; ???} ???if (($asc >= -14630 && $asc <= -14150) || $fir == ‘Q‘) { ???????return ‘Q‘; ???} ???if (($asc >= -14149 && $asc <= -14091) || $fir == ‘R‘) { ???????return ‘R‘; ???} ???if (($asc >= -14090 && $asc <= -13319) || $fir == ‘S‘) { ???????return ‘S‘; ???} ???if (($asc >= -13318 && $asc <= -12839) || $fir == ‘T‘) { ???????return ‘T‘; ???} ???if (($asc >= -12838 && $asc <= -12557) || $fir == ‘W‘) { ???????return ‘W‘; ???} ???if (($asc >= -12556 && $asc <= -11848) || $fir == ‘X‘) { ???????return ‘X‘; ???} ???if (($asc >= -11847 && $asc <= -11056) || $fir == ‘Y‘) { ???????return ‘Y‘; ???} ???if (($asc >= -11055 && $asc <= -10247) || $fir == ‘Z‘) { ???????return ‘Z‘; ???} ???return ‘‘;}