PHP将字符串转为HTML实体引用

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class HtmlEncode {
    static $_convertToHtmlEntitiesSrcEncoding='UTF-8';

    /**
	 * 将非ASCII字符串转换成HTML实体
	 *
	 * @example HtmlEncode::encode("我信了"); //输出:我信了
	 * @param string $s 要进行编码的字符串
	 * @return string 返回HTML实体引用
	 */
	public static function encode($s,$srcEncoding='UTF-8') {
		self::$_convertToHtmlEntitiesSrcEncoding=$srcEncoding;
		return preg_replace_callback('|[^\x00-\x7F]+|',array(__CLASS__,'_convertToHtmlEntities'),$s);
	}

	public static function _convertToHtmlEntities($data) {
		if (is_array($data)) {
			$chars=str_split(iconv(self::$_convertToHtmlEntitiesSrcEncoding,"UCS-2BE",$data[0]),2);
			$chars=array_map(array(__CLASS__,__FUNCTION__),$chars);
			return join("",$chars);
		} else {
			$code=hexdec(sprintf("%02s%02s;",dechex(ord($data {0})),dechex(ord($data {1}))));
			return sprintf("&#%s;",$code);
		}
	}

}