PHP的UTF-8中文转拼音处理类（性能已优化至极致）

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   /**     * 将中文编码成拼音     * @param string $utf8Data utf8字符集数据     * @param string $sRetFormat 返回格式 [head:首字母|all:全拼音]     * @return string     */	public static function encode($utf8Data, $sRetFormat='head'){		$sGBK = iconv('UTF-8', 'GBK', $utf8Data);		$aBuf = array();		for ($i=0, $iLoop=strlen($sGBK); $i<$iLoop; $i++) {			$iChr = ord($sGBK{$i});			if ($iChr>160)				$iChr = ($iChr<<8) + ord($sGBK{++$i}) - 65536;			if ('head' === $sRetFormat)				$aBuf[] = substr(self::zh2py($iChr),0,1);			else				$aBuf[] = self::zh2py($iChr);		}		if ('head' === $sRetFormat)			return implode('', $aBuf);		else			return implode(' ', $aBuf);	}	/**	 * 中文转换到拼音(每次处理一个字符)	 * @param number $iWORD 待处理字符双字节	 * @return string 拼音	 */	private static function zh2py($iWORD) {		if($iWORD>0 && $iWORD<160 ) {			return chr($iWORD);		} elseif ($iWORD<-20319||$iWORD>-10247) {			return '';		} else {			foreach (self::$_aMaps as $py => $code) {				if($code > $iWORD) break;				$result = $py;			}			return $result;		}	}}?>

如果你使用GBK或GB2312字符集，只需要去掉iconv函数，直接赋值，不需要转换就行。

不多说了，直接上代码，完全开源你拿去直接用。如果你觉得有用，使用时请帮忙保留作者的信息。