Php Chinese character string first letter function acquisition

FunctionchineseFirst ($ str) {$ str = iconv (& quot; UTF-8 & quot;, & quot; gb2312 & quot;, $ str); if the program is gbk, this line will be commented out to determine whether all strings are in Chinese (PS: ^ _ ^ good php learning exchange group:

Function chineseFirst ($ str) {$ str = iconv ("UTF-8", "gb2312", $ str); // if the program is gbk, this line should be commented out // judge whether all strings are in Chinese (PS: ^ _ ^ good php learning exchange group: 276167802, verification: csl, if you are interested, join in for discussion) if (preg_match ("/^ [\ x7f-\ xff]/", $ str) {$ fchar = ord ($ str {0 }); if ($ fchar> = ord ("A") and $ fchar <= ord ("z") return strtoupper ($ str {0}); $ a = $ str; $ val = ord ($ a {0}) * 256 + ord ($ a {1})-65536; if ($ val >=- 20319 and $ val <=-20284) return "A"; if ($ val >=- 20283 and $ val <=-19776) return "B"; if ($ val >=- 19775 and $ val <=- 19219) return "C "; if ($ val >=- 19218 and $ val <=-18711) return "D"; if ($ val >=- 18710 and $ val <=-18527) return "E"; if ($ val >=- 18526 and $ val <=-18240) return "F "; if ($ val >=- 18239 and $ val <=-17923) return "G"; if ($ val >=- 17922 and $ val <=-17418) return "H"; if ($ val >=- 17417 and $ val <=- 16475) return "J "; if ($ val >=- 16474 and $ val <=-16213) return "K"; if ($ val >=- 16212 and $ val <=-15641) return "L"; if ($ val >=- 15640 and $ val <=- 15166) return "M "; if ($ val >=- 15165 and $ val <=-14923) return "N"; if ($ val >=- 14922 and $ val <=-14915) return "O"; if ($ val >=- 14914 and $ val <=- 14631) return "P "; if ($ val >=- 14630 and $ val <=-14150) return "Q"; if ($ val >=- 14149 and $ val <=-14091) return "R"; if ($ val >=- 14090 and $ val <=-13319) return "S "; if ($ val >=- 13318 and $ val <=-12839) return "T"; if ($ val >=- 12838 and $ val <=-12557) return "W"; if ($ val >=- 12556 and $ val <=- 11848) return "X "; if ($ val >=- 11847 and $ val <=-11056) return "Y"; if ($ val >=- 11055 and $ val <=-10247) return "Z" ;}else {return false ;}}