PHP将字符串转为HTML实体引用

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 $s 要进行编码的字符串
* @return string 返回HTML实体引用 www.2cto.com
*/
public static function encode($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);
}
}

}