php获取首字母

[PHP]代码

<?php        $d = array(         array("a",-20319),         array("ai",-20317),         array("an",-20304),         array("ang",-20295),         array("ao",-20292),         array("ba",-20283),         array("bai",-20265),         array("ban",-20257),         array("bang",-20242),         array("bao",-20230),         array("bei",-20051),         array("ben",-20036),         array("beng",-20032),         array("bi",-20026),         array("bian",-20002),         array("biao",-19990),         array("bie",-19986),         array("bin",-19982),         array("bing",-19976),         array("bo",-19805),         array("bu",-19784),         array("ca",-19775),         array("cai",-19774),         array("can",-19763),         array("cang",-19756),         array("cao",-19751),         array("ce",-19746),         array("ceng",-19741),         array("cha",-19739),         array("chai",-19728),         array("chan",-19725),         array("chang",-19715),         array("chao",-19540),         array("che",-19531),         array("chen",-19525),         array("cheng",-19515),         array("chi",-19500),         array("chong",-19484),         array("chou",-19479),         array("chu",-19467),         array("chuai",-19289),         array("chuan",-19288),         array("chuang",-19281),         array("chui",-19275),         array("chun",-19270),         array("chuo",-19263),         array("ci",-19261),         array("cong",-19249),         array("cou",-19243),         array("cu",-19242),         array("cuan",-19238),         array("cui",-19235),         array("cun",-19227),         array("cuo",-19224),         array("da",-19218),         array("dai",-19212),         array("dan",-19038),         array("dang",-19023),         array("dao",-19018),         array("de",-19006),         array("deng",-19003),         array("di",-18996),         array("dian",-18977),         array("diao",-18961),         array("die",-18952),         array("ding",-18783),         array("diu",-18774),         array("dong",-18773),         array("dou",-18763),         array("du",-18756),         array("duan",-18741),         array("dui",-18735),         array("dun",-18731),         array("duo",-18722),         array("e",-18710),         array("en",-18697),         array("er",-18696),         array("fa",-18526),         array("fan",-18518),         array("fang",-18501),         array("fei",-18490),         array("fen",-18478),         array("feng",-18463),         array("fo",-18448),         array("fou",-18447),         array("fu",-18446),         array("ga",-18239),         array("gai",-18237),         array("gan",-18231),         array("gang",-18220),         array("gao",-18211),         array("ge",-18201),         array("gei",-18184),         array("gen",-18183),         array("geng",-18181),         array("gong",-18012),         array("gou",-17997),         array("gu",-17988),         array("gua",-17970),         array("guai",-17964),         array("guan",-17961),         array("guang",-17950),         array("gui",-17947),         array("gun",-17931),         array("guo",-17928),         array("ha",-17922),         array("hai",-17759),         array("han",-17752),         array("hang",-17733),         array("hao",-17730),         array("he",-17721),         array("hei",-17703),         array("hen",-17701),         array("heng",-17697),         array("hong",-17692),         array("hou",-17683),         array("hu",-17676),         array("hua",-17496),         array("huai",-17487),         array("huan",-17482),         array("huang",-17468),         array("hui",-17454),         array("hun",-17433),         array("huo",-17427),         array("ji",-17417),         array("jia",-17202),         array("jian",-17185),         array("jiang",-16983),         array("jiao",-16970),         array("jie",-16942),         array("jin",-16915),         array("jing",-16733),         array("jiong",-16708),         array("jiu",-16706),         array("ju",-16689),         array("juan",-16664),         array("jue",-16657),         array("jun",-16647),         array("ka",-16474),         array("kai",-16470),         array("kan",-16465),         array("kang",-16459),         array("kao",-16452),         array("ke",-16448),         array("ken",-16433),         array("keng",-16429),         array("kong",-16427),         array("kou",-16423),         array("ku",-16419),         array("kua",-16412),         array("kuai",-16407),         array("kuan",-16403),         array("kuang",-16401),         array("kui",-16393),         array("kun",-16220),         array("kuo",-16216),         array("la",-16212),         array("lai",-16205),         array("lan",-16202),         array("lang",-16187),         array("lao",-16180),         array("le",-16171),         array("lei",-16169),         array("leng",-16158),         array("li",-16155),         array("lia",-15959),         array("lian",-15958),         array("liang",-15944),         array("liao",-15933),         array("lie",-15920),         array("lin",-15915),         array("ling",-15903),         array("liu",-15889),         array("long",-15878),         array("lou",-15707),         array("lu",-15701),         array("lv",-15681),         array("luan",-15667),         array("lue",-15661),         array("lun",-15659),         array("luo",-15652),         array("ma",-15640),         array("mai",-15631),         array("man",-15625),         array("mang",-15454),         array("mao",-15448),         array("me",-15436),         array("mei",-15435),         array("men",-15419),         array("meng",-15416),         array("mi",-15408),         array("mian",-15394),         array("miao",-15385),         array("mie",-15377),         array("min",-15375),         array("ming",-15369),         array("miu",-15363),         array("mo",-15362),         array("mou",-15183),         array("mu",-15180),         array("na",-15165),         array("nai",-15158),         array("nan",-15153),         array("nang",-15150),         array("nao",-15149),         array("ne",-15144),         array("nei",-15143),         array("nen",-15141),         array("neng",-15140),         array("ni",-15139),         array("nian",-15128),         array("niang",-15121),         array("niao",-15119),         array("nie",-15117),         array("nin",-15110),         array("ning",-15109),         array("niu",-14941),         array("nong",-14937),         array("nu",-14933),         array("nv",-14930),         array("nuan",-14929),         array("nue",-14928),         array("nuo",-14926),         array("o",-14922),         array("ou",-14921),         array("pa",-14914),         array("pai",-14908),         array("pan",-14902),         array("pang",-14894),         array("pao",-14889),         array("pei",-14882),         array("pen",-14873),         array("peng",-14871),         array("pi",-14857),         array("pian",-14678),         array("piao",-14674),         array("pie",-14670),         array("pin",-14668),         array("ping",-14663),         array("po",-14654),         array("pu",-14645),         array("qi",-14630),         array("qia",-14594),         array("qian",-14429),         array("qiang",-14407),         array("qiao",-14399),         array("qie",-14384),         array("qin",-14379),         array("qing",-14368),         array("qiong",-14355),         array("qiu",-14353),         array("qu",-14345),         array("quan",-14170),         array("que",-14159),         array("qun",-14151),         array("ran",-14149),         array("rang",-14145),         array("rao",-14140),         array("re",-14137),         array("ren",-14135),         array("reng",-14125),         array("ri",-14123),         array("rong",-14122),         array("rou",-14112),         array("ru",-14109),         array("ruan",-14099),         array("rui",-14097),         array("run",-14094),         array("ruo",-14092),         array("sa",-14090),         array("sai",-14087),         array("san",-14083),         array("sang",-13917),         array("sao",-13914),         array("se",-13910),         array("sen",-13907),         array("seng",-13906),         array("sha",-13905),         array("shai",-13896),         array("shan",-13894),         array("shang",-13878),         array("shao",-13870),         array("she",-13859),         array("shen",-13847),         array("sheng",-13831),         array("shi",-13658),         array("shou",-13611),         array("shu",-13601),         array("shua",-13406),         array("shuai",-13404),         array("shuan",-13400),         array("shuang",-13398),         array("shui",-13395),         array("shun",-13391),         array("shuo",-13387),         array("si",-13383),         array("song",-13367),         array("sou",-13359),         array("su",-13356),         array("suan",-13343),         array("sui",-13340),         array("sun",-13329),         array("suo",-13326),         array("ta",-13318),         array("tai",-13147),         array("tan",-13138),         array("tang",-13120),         array("tao",-13107),         array("te",-13096),         array("teng",-13095),         array("ti",-13091),         array("tian",-13076),         array("tiao",-13068),         array("tie",-13063),         array("ting",-13060),         array("tong",-12888),         array("tou",-12875),         array("tu",-12871),         array("tuan",-12860),         array("tui",-12858),         array("tun",-12852),         array("tuo",-12849),         array("wa",-12838),         array("wai",-12831),         array("wan",-12829),         array("wang",-12812),         array("wei",-12802),         array("wen",-12607),         array("weng",-12597),         array("wo",-12594),         array("wu",-12585),         array("xi",-12556),         array("xia",-12359),         array("xian",-12346),         array("xiang",-12320),         array("xiao",-12300),         array("xie",-12120),         array("xin",-12099),         array("xing",-12089),         array("xiong",-12074),         array("xiu",-12067),         array("xu",-12058),         array("xuan",-12039),         array("xue",-11867),         array("xun",-11861),         array("ya",-11847),         array("yan",-11831),         array("yang",-11798),         array("yao",-11781),         array("ye",-11604),         array("yi",-11589),         array("yin",-11536),         array("ying",-11358),         array("yo",-11340),         array("yong",-11339),         array("you",-11324),         array("yu",-11303),         array("yuan",-11097),         array("yue",-11077),         array("yun",-11067),         array("za",-11055),         array("zai",-11052),         array("zan",-11045),         array("zang",-11041),         array("zao",-11038),         array("ze",-11024),         array("zei",-11020),         array("zen",-11019),         array("zeng",-11018),         array("zha",-11014),         array("zhai",-10838),         array("zhan",-10832),         array("zhang",-10815),         array("zhao",-10800),         array("zhe",-10790),         array("zhen",-10780),         array("zheng",-10764),         array("zhi",-10587),         array("zhong",-10544),         array("zhou",-10533),         array("zhu",-10519),         array("zhua",-10331),         array("zhuai",-10329),         array("zhuan",-10328),         array("zhuang",-10322),         array("zhui",-10315),         array("zhun",-10309),         array("zhuo",-10307),         array("zi",-10296),         array("zong",-10281),         array("zou",-10274),         array("zu",-10270),         array("zuan",-10262),         array("zui",-10260),         array("zun",-10256),         array("zuo",-10254)         );    function g($num){  global $d;  if($num>0&&$num<160){     return chr($num);  }  elseif($num<-20319||$num>-10247){     return "";  }else{     for($i=count($d)-1;$i>=0;$i--){      if($d[$i][1]<=$num)break;     }     return $d[$i][0];  }  }    function c($str){  $ret="";  for($i=0;$i<strlen($str);$i++){     $p=ord(substr($str,$i,1));     if($p>160){      $q=ord(substr($str,++$i,1));      $p=$p*256+$q-65536;     }     $ret.=g($p);  }  return $ret;  }    echo ( substr( c("比特福"), 0, 1 ) );  ?>