请问提取首字母有什么好的方案？哪种更好

Question

目前知道以下这两种方案：
1. 录入时提取中文首字拼音的首字母存入数据库
2. 前台展示之前提取首字母并归类

有两个问题：
1. 以上的两种方案哪个更优？或者说有没其它方案？
2. 提取首字母有什么好的方案？

Answer 1

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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "zhou|zhu|zhua|zhuai|zhuan|zhuang|zhui|zhun|zhuo|zi|zong|zou|zu|zuan|zui|zun|zuo";&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; $_DataValue = "-20319|-20317|-20304|-20295|-20292|-20283|-20265|-20257|-20242|-20230|-20051|-20036|-20032|-20026|-20002|-19990".&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "|-19986|-19982|-19976|-19805|-19784|-19775|-19774|-19763|-19756|-19751|-19746|-19741|-19739|-19728|-19725".&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "|-19715|-19540|-19531|-19525|-19515|-19500|-19484|-19479|-19467|-19289|-19288|-19281|-19275|-19270|-19263".&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "|-19261|-19249|-19243|-19242|-19238|-19235|-19227|-19224|-19218|-19212|-19038|-19023|-19018|-19006|-19003".&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "|-18996|-18977|-18961|-18952|-18783|-18774|-18773|-18763|-18756|-18741|-18735|-18731|-18722|-18710|-18697".&nbsp;&nbsp; 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&nbsp; &nbsp; &nbsp; "|-10764|-10587|-10544|-10533|-10519|-10331|-10329|-10328|-10322|-10315|-10309|-10307|-10296|-10281|-10274".&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "|-10270|-10262|-10260|-10256|-10254";&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; $_TDataKey &nbsp; = explode('|', $_DataKey);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; $_TDataValue = explode('|', $_DataValue);&nbsp; &nbsp; &nbsp; &nbsp; $_Data = array_combine($_TDataKey, $_TDataValue);&nbsp; &nbsp; &nbsp; &nbsp; arsort($_Data);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; reset($_Data);&nbsp; &nbsp; &nbsp; &nbsp; if($_Code!= 'gb2312') $_String = _U2_Utf8_Gb($_String);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; $_Res = '';&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; for($i=0; $i<strlen($_String); $i++) {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_P = ord(substr($_String, $i, 1));&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if($_P>160) {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_Q = ord(substr($_String, ++$i, 1)); $_P = $_P*256 + $_Q - 65536;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_Res .= _Pinyin($_P, $_Data);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; return preg_replace("/[^a-z0-9]*/", '', $_Res);&nbsp;}&nbsp;function _Pinyin($_Num, $_Data){&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; if($_Num>0 && $_Num<160 ){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return chr($_Num);&nbsp; &nbsp; &nbsp; &nbsp; }elseif($_Num<-20319 || $_Num>-10247){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return '';&nbsp; &nbsp; &nbsp; &nbsp; }else{&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foreach($_Data as $k=>$v){ if($v<=$_Num) break; }&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return $k;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;}function _U2_Utf8_Gb($_C){&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; $_String = '';&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; if($_C < 0x80){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= $_C;&nbsp; &nbsp; &nbsp; &nbsp; }elseif($_C < 0x800) {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0xC0 | $_C>>6);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0x80 | $_C & 0x3F);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }elseif($_C < 0x10000){&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0xE0 | $_C>>12);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0x80 | $_C>>6 & 0x3F);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0x80 | $_C & 0x3F);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }elseif($_C < 0x200000) {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0xF0 | $_C>>18);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0x80 | $_C>>12 & 0x3F);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0x80 | $_C>>6 & 0x3F);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_String .= chr(0x80 | $_C & 0x3F);&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; return iconv('UTF-8', 'GB2312', $_String);&nbsp;}&nbsp;//测试echo Pinyin('中文字','gb2312'); //第二个参数“1”可随意设置即为utf8编码?>

Answer 2

存入数据库吧，这样以后如果做首字母匹配搜索也方便。