如何编写PHP函数获取汉字拼音首字母，形成长尾词：PHP函数如何提取汉字拼音首字母？

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php!-- PHP 函数：获取汉字的首字母**@param unknown_type $str@return 获取汉字的首字母*/function getFirstChar($str){ $fchar=$str[0]; // 判断是否为汉字 if(ord($fchar) >=ord('A') && ord($fchar) =ord('A') && ord($fchar) <=ord('Z')) { return strtoupper($fchar); } else { // 非汉字字符处理 return ''; }}

<!--?php /** * @param unknown_type $str * @return 取得汉字的首字母 */ function getfirstchar($str){ $fchar=$str[0]; //判断是否为字符串 if(ord($fchar)-->=ord("A") && ord($fchar)<=ord("z") ) return strtoupper($fchar); $str=iconv("UTF-8","gb2312", $str); $asc=ord($str[0])*256+ord($str[1])-65536; if($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 $asc<=-16475)return "I"; if($asc>=-16474 and $asc<=-16213)return "J"; if($asc>=-16212 and $asc<=-15641)return "K"; if($asc>=-15640 and $asc<=-15166)return "L"; if($asc>=-15165 and $asc<=-14923)return "M"; if($asc>=-14922 and $asc<=-14915)return "N"; if($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; } echo getfirstchar("哈哈!");