Question

我有这个插件的两个选项。

（1）nofollow内容中的所有外部链接

和/或

（2）没有跟随此目标文件夹的链接（输入目标文件夹的绝对URL）

在选项2中，链接可以是内部或外部。

可以设置两个选项，既不设置选项，也可以设置单个选项。

if(get_option('my_nofollow') || get_option('my_nofollow_folder')){add_filter('wp_insert_post_data', 'save_my_nofollow' );}

所以当我设置其中一个选项时，我正在设置一个过滤器到下面的功能。我的问题是，如何更改函数以便设置if（2）但不设置（1）我只将nofollow添加到与目标文件夹URL匹配的链接中？

function save_my_nofollow($content) {
$my_folder =  get_option('my_nofollow_folder');
$matches = array();
    preg_match_all('~<a.*>~isU',$content["post_content"],$matches);
    for ( $i = 0; $i <= sizeof($matches[0]); $i++){
        if ( isset($matches[0][$i]) && (preg_match('~' . $my_folder . '~', $matches[0][$i]) 
               || !preg_match( '~'.get_bloginfo('url').'~',$matches[0][$i]))){
        $result = trim($matches[0][$i],">");
        $result .= ' rel="nofollow">';
        $content["post_content"] = str_replace($matches[0][$i], $result, $content["post_content"]);
        }
    }
    return $content;
}

更新后的代码和最佳答案：

if(get_option('rseo_nofollow') 
    || get_option('rseo_nofollow_folder')){
    add_filter('wp_insert_post_data', 'save_rseo_nofollow' );
    }

function save_rseo_nofollow($content) {
    $folder =  get_option('rseo_nofollow_folder');
    $externalNoFollow = get_option('rseo_nofollow_external');
    $folderNoFollow = get_option('rseo_nofollow_folder');
    $extRegex = '~'.preg_quote(get_bloginfo('url'), '~') . '~i';
    $intRegex = '~'.preg_quote($folder, '~') . '~i';

    $dom = new DomDocument();
    libxml_use_internal_errors(true);
    $dom->loadXml('<root>' . $content['post_content'] . '</root>');

    $links = $dom->getElementsByTagName('a');
    foreach ($links as $link) {
        $href = $link->getAttribute('href');
        if ($href && $externalNoFollow && !preg_match($extRegex, $href)) {
            $link->setAttribute('rel', 'nofollow');
        } elseif ($href && $folderNoFollow && preg_match($intRegex, $href)) {
            $link->setAttribute('rel', 'nofollow');
        }
    }
//  print $dom->saveXml();die;
    //Since we want to strip the root element, we must do so:
    $newContent = '';
    $root = $dom->getElementsByTagName('root')->item(0);
    foreach ($root->childNodes as $child) {
        $newContent .= $dom->saveXml($child);
    }
    $content['post_content'] = $newContent;
return $content;
}

输入

This is the <a href="http://cnn.com">test</a>. This is the test.

输出

This is the <a rel="nofollow" href="&quot;http://cnn.com&quot;">test</a>. This is the test.

Answer 1

不要使用正则表达式解析HTML。这不是一个好主意......而是使用Dom功能。请注意，您可能需要将内容包装在外部根标记中（我在此处添加了<root>）（。

$externalNoFollow = get_option('my_nofollow_external');
$folderNoFollow = get_option('my_nofollow_folder');
$extRegex = '~'.preg_quote(get_bloginfo('url'), '~') . '~i';
$intRegex = '~'.preg_quote($folder, '~') . '~i';

$dom = new DomDocument();
libxml_use_internal_errors(true);
if (!$dom->loadHtml('<html><body>' . $content['post_content'] . '</body></html>')) {
    /** Error out, since the loading failed. 
        Make sure `$content['post_content']` is valid html
    **/
    die('Invalid HTML detected');
}

$links = $dom->getElementsByTagName('a');
foreach ($links as $link) {
    $href = $link->getAttribute('href');
    if ($href && $externalNoFollow && !preg_match($extRegex, $href)) {
        $link->setAttribute('rel', 'nofollow');
    } elseif ($href && $folderNoFollow && preg_match($intRegex, $href)) {
        $link->setAttribute('rel', 'nofollow');
    }
}
//Since we want to strip the root element, we must do so:
$newContent = '';
$root = $dom->getElementsByTagName('body')->item(0);
foreach ($root->childNodes as $child) {
    $newContent .= $dom->saveXml($child);
}

$content['post_content'] = $newContent;
return $content;

注意，您应该添加无效HTML的实际错误处理...

preg_match帮助互斥条件匹配

1 个答案: