<?php
/**
 * 汉字转拼音
 * @param string $str 待转换的字符串
 * @param string $charset 字符串编码
 * @param bool $ishead 是否只提取首字母
 * @return string 返回结果
 */
function GetPinyin($str,$charset="utf-8",$ishead = 0) {
	$restr = '';
	$str = trim($str);
	if($charset=="utf-8"){
		$str=iconv("utf-8","gb2312",$str);
	}
	$slen = strlen($str);
	$pinyins=array();
	if ($slen < 2) {
		return $str;
	}
	$fp = fopen('./Public/js/pinyin.dat', 'r');
	while (!feof($fp)) {
		$line = trim(fgets($fp));
		$pinyins[$line[0] . $line[1]] = substr($line, 3, strlen($line) - 3);
	}
	fclose($fp);
	
	for ($i = 0; $i < $slen; $i++) {
		if (ord($str[$i]) > 0x80) {
			$c = $str[$i] . $str[$i + 1];
			$i++;
			if (isset($pinyins[$c])) {
				if ($ishead == 0) {
					$restr .= $pinyins[$c];
				} else {
					$restr .= $pinyins[$c][0];
				}
			} else {
				$restr .= "_";
			}
		} else if (preg_match("/[a-z0-9]/i", $str[$i])) {
			$restr .= $str[$i];
		} else {
			$restr .= "_";
		}
	}
	return $restr;
}