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办法是利用矩阵，汉字的组成方式是两个ascii字符，一个高位码，一个低位码，界限分别是128-264 64-128
每个汉字拼音最长为8个字符，由此组成二维矩阵进行查询，弊端是无法解决多音字问题
class pinyin{
/*
是否将拼音文件读取到内存内，损耗少许内存,几百kb的样子，速度可以略有提升，
*/
var $ismemorycache = 1;/*
是否只获取首字母
*/
var $isfrist = 1;/*
拼音矩阵文件地址
*/
var $path = "py.qdb";/*
内存拼音矩阵
*/
var $memorycache;/*
拼音文件句柄
*/
var $handle;/*
转换发生错误盒子
*/
var $errormsgbox;/*
转换结果
*/
var $result;
var $array = array();
var $n_t = array("ā" => "a","á" => "a","ǎ" => "a","à" => "a","?" => "a",
"ō" => "o","ó" => "o","ǒ" => "o","ò" => "o",
"ē" => "e","é" => "e","ě" => "e","è" => "e","ê" => "e",
"ī" => "i","í" => "i","ǐ" => "i","ì" => "i",
"ū" => "u","ú" => "u","ǔ" => "u","ù" => "u",
"ǖ" => "v","ǘ" => "v","ǚ" => "v","ǜ" => "v","ü" => "v"
);/*
转换入口
@params $str 所需转换字符,$istonemark 是否保留音标 $suffix 尾缀,默认为空格
*/
function chinesetopinyin($str,$istonemark = 0,$suffix = ""){
$this->py($str,$istonemark,$suffix);
return $this -> result;
}function get(){
return $this -> result;
}
function py($str,$n = 0,$s = ""){
$strlength = strlen($str);
if($strlength == 0){ return ""; }
$this->result = "";
if(is_array($str)){
foreach($str as $key => $val){
$str[$key] = $this->py($val,$n,$s);
}
return;
}if(empty($this->handle)){
if(!file_exists($this->path)){
$this->addoneerrormsg(1,"拼音文件路径不存在");
return false;}
if(is_array($str)){
foreach($str as $key => $val){
$str[$key] = $this->py($val,$n,$s);
}
}
if($this -> ismemorycache){
if(!$this->memorycache){
$this->memorycache = file_get_contents($this->path);
for($i = 0 ; $i < $strlength ; $i++){
$ord1 = ord(substr($str,$i,1));
if($ord1 > 128){
$ord2 = ord(substr($str, ++$i, 1));
if(!isset($this->array[$ord1][$ord2])){
$leng = ($ord1 - 129) * ((254 - 63) * 8 + 2) + ($ord2 - 64) * 8;
$this->array[$ord1][$ord2] = trim(substr($this->memorycache,$leng,8));
}
$strtrlen = $this->isfrist ? 1 : 8;
$this->result .= substr($this ->array[$ord1][$ord2],0,$strtrlen).$s;
}else{
$this->result .= substr($str,$i,1);
}}
}
}else{
$this->handle = fopen($this->path,"r");
for($i = 0 ; $i < $strlength ; $i++){
$ord1 = ord(substr($str,$i,1));
if($ord1 > 128){
$ord2 = ord(substr($str, ++$i, 1));
if(!isset($this->array[$ord1][$ord2])){
$leng = ($ord1 - 129) * ((254 - 63) * 8 + 2) + ($ord2 - 64) * 8;
fseek($this -> handle,$leng);
$this->array[$ord1][$ord2] = trim(fgets($this->handle,8));}
$strtrlen = $this->isfrist ? 1 : 8;$this->result .= substr($this ->array[$ord1][$ord2],0,$strtrlen).$s;
}else{ $this->result .= substr($str,$i,1); }}
}if(!$n){ $this -> result = strtr($this -> result,$this -> n_t);}
}
}
function addoneerrormsg($no,$reason){$this->errormsgbox[] = "error:" . $no . "," . $reason;
}function showerrormsg(){
foreach($this->errormsgbox as $val){
echo $val."rnrn";
}
}function __destruct(){
if(is_array($this->errormsgbox)){
$this->showerrormsg();
}
}}
之前遇见过这个难题，发现流传的代码都不怎么完善，汉字库总共有20k+的汉字，大多数的是拿几百个常用汉字打算糊弄过去，在火星文流传的今天，是不行的。
还有种读取词典然后转换的，每行一个汉字|拼音，这种弊端非常大，速度慢，耗费巨大内存，仅仅explode一下读入数组，再循环一次，就能耗费上百m的内存，如果一个单页面耗费上百m，负载稍微大点只能泪奔了。