最近遇到一个问题，根据项目需求，需要根据所激活的城市，获取首字母大写。
话不多说、先安排代码：
function getfirstchar($s0) {$fchar = ord(substr($s0, 0, 1));if (($fchar >= ord("a") and $fchar <= ord("z"))or($fchar >= ord("A") and $fchar <= ord("Z"))) return strtoupper(chr($fchar));$s = iconv("UTF-8", "GBK", $s0);$asc = ord($s{0}) * 256 + ord($s{1})-65536;if ($asc >= -20319 and $asc <= -20284)return "A";if ($asc >= -20283 and $asc <= -19776)return "B";if ($asc >= -19775 and $asc <= -19219)return "C";if ($asc >= -19218 and $asc <= -18711)return "D";if ($asc >= -18710 and $asc <= -18527)return "E";if ($asc >= -18526 and $asc <= -18240)return "F";if ($asc >= -18239 and $asc <= -17923)return "G";if ($asc >= -17922 and $asc <= -17418)return "H";if ($asc >= -17417 and $asc <= -16475)return "J";if ($asc >= -16474 and $asc <= -16213)return "K";if ($asc >= -16212 and $asc <= -15641)return "L";if ($asc >= -15640 and $asc <= -15166)return "M";if ($asc >= -15165 and $asc <= -14923)return "N";if ($asc >= -14922 and $asc <= -14915)return "O";if ($asc >= -14914 and $asc <= -14631)return "P";if ($asc >= -14630 and $asc <= -14150)return "Q";if ($asc >= -14149 and $asc <= -14091)return "R";if ($asc >= -14090 and $asc <= -13319)return "S";if ($asc >= -13318 and $asc <= -12839)return "T";if ($asc >= -12838 and $asc <= -12557)return "W";if ($asc >= -12556 and $asc <= -11848)return "X";if ($asc >= -11847 and $asc <= -11056)return "Y";if ($asc >= -11055 and $asc <= -10247)return "Z";return null;}function mb_str_split($string) {return preg_split('/(?<!^)(?!$)/u', $string);}function get_letter($string) {$charlist = $this->mb_str_split($string);return $this->getfirstchar($charlist);}
在你的方法调用：
model('CommonModel')->get_letter("黑龙江省");
结果：HLJS
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