nofollow
為站外鏈接一個個加nofollow還是比較麻煩的.通過代碼能否實現(xiàn)給站外鏈接自動添加nofollow和在新窗口打開, 如果鏈接已經(jīng)有rel="nofollow" 和target="_blank"屬性, 則不會再次添加.
添加以下代碼到WordPress主題的functions.php文件即可
//出站鏈接自動添加nofollow和在新窗口打開
add_filter( 'the_content', 'auto_nofollow_for_external_link_wmsoho');
function auto_nofollow_for_external_link_wmsoho( $content ) {
$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>";
if(preg_match_all("/$regexp/siU", $content, $matches, PREG_SET_ORDER)) {
if( !empty($matches) ) {
$srcUrl = get_option('siteurl');
for ($i=0; $i < count($matches); $i++)
{
$tag = $matches[$i][0];
$tag2 = $matches[$i][0];
$url = $matches[$i][0];
$noFollow = '';
$pattern = '/target\s*=\s*"\s*_blank\s*"/';
preg_match($pattern, $tag2, $match, PREG_OFFSET_CAPTURE);
if( count($match) < 1 )
$noFollow .= ' target="_blank" ';
$pattern = '/rel\s*=\s*"\s*[n|d]ofollow\s*"/';
preg_match($pattern, $tag2, $match, PREG_OFFSET_CAPTURE);
if( count($match) < 1 )
$noFollow .= ' rel="nofollow" ';
$pos = strpos($url,$srcUrl);
if ($pos === false) {
$tag = rtrim ($tag,'>');
$tag .= $noFollow.'>';
$content = str_replace($tag2,$tag,$content);
}
}
}
}
$content = str_replace(']]>', ']]>', $content);
return $content;
}
