php，忽略刮取/回显数据的值

Question

想知道是否有人知道可以使用此刮取/输出代码修改的内容，这些代码会吐出如下值：+ 40.07％，以便忽略某些值。例如，我已经在我的网站上有一个自动“+”放在每个值的前面。但是当从该源进行抓取时，它还在正值前面提供+，所以当我只需要一个+时，我得到++ 40.07类型的输出。谁知道可以添加什么来忽略输出+？我在php上非常糟糕，主要是从帮助中得到这个。非常感谢你。

    // get sandpdailychange
    function getSandpdailychange(){
    $doc = new DOMDocument;

    // We don't want to bother with white spaces
    $doc->preserveWhiteSpace = false;

    // Most HTML Developers are chimps and produce invalid markup...
    $doc->strictErrorChecking = false;
    $doc->recover = true;

    $doc->loadHTMLFile('http://quotes.wsj.com/index/SPX');



    $xpath = new DOMXPath($doc);

    $query = "//span[@id='quote_change']";




    $entries = $xpath->query($query);
    foreach ($entries as $entry) {
        $result = trim($entry->textContent); 
        $ret_ = explode(' ', $result);
        //make sure every element in the array don't start or end with blank
        foreach ($ret_ as $key=>$val){
            $ret_[$key]=trim($val);
        }
        //delete the empty element and the element is blank "\n" "\r" "\t"
        //I modify this line
        $ret_ = array_values(array_filter($ret_,deleteBlankInArray));

        //echo the last element
        file_put_contents(globalVars::$_cache_dir . "sandpdailychange", 
     $ret_[0]);

    }
  }