PHP Parse error: parse error, unexpected T_OBJECT_OPERATOR

<?php   
    
    $URL="http://dict.cn/ws.php?q=content";   
    $dom = new DomDocument();    
    $dom->load($URL);   
    //print"<pre>";   
    //print( $dom->saveXML());   
    $dictArray = $dom->getElementsByTagName("dict");   
    foreach( $dictArray as $dict ) {   
          $key = $dict->getElementsByTagName("key");   
          $key=$key->item(0)->nodeValue;   
          $key= iconv("UTF-8","GB2312",$key);     //注意要转码对于中文，因为XML默认为UTF-8格式   
          echo ("***输出>key>的内容：****：".$key);   
  
          $lang = $dict->getElementsByTagName("lang");   
          $lang = utf8_decode($lang->item(0)->nodeValue);   
          echo "<br>";   
          echo ("***输出>lang>的内容：****：".$lang);   
     }   
  
?>   

客户反馈以上代码空白，apache报错日志以下

PHP Parse error:  parse error, unexpected T_OBJECT_OPERATOR in /var/www/vhosts/xxh.com/httpdocs/test.php on line 11
Content-type: text/html
X-Powered-By: PHP/4.3.9

后来传到PHP5.1版本发现正常。

PHP 4.3.9 有问题
PHP 5.1.6 (cli) 没问题