
如何使用浏览器检查元素工具
_make_clickable_rel_attr ( $url )
_make_clickable_rel_attr(): 这个函数用来给在一串文本中发现的任何链接添加一个rel属性。这对于为链接添加rel属性以防止搜索引擎机器人跟踪它们,或指定链接应在新窗口或标签页中打开是很有用的。
function _make_clickable_rel_attr( $url ) { $rel_parts = array(); $scheme = strtolower( wp_parse_url( $url, PHP_URL_SCHEME ) ); $nofollow_schemes = array_intersect( wp_allowed_protocols(), array( 'https', 'http' ) ); // Apply "nofollow" to external links with qualifying URL schemes (mailto:, tel:, etc... shouldn't be followed). if ( ! wp_is_internal_link( $url ) && in_array( $scheme, $nofollow_schemes, true ) ) { $rel_parts[] = 'nofollow'; } // Apply "ugc" when in comment context. if ( 'comment_text' === current_filter() ) { $rel_parts[] = 'ugc'; } $rel = implode( ' ', $rel_parts ); /** * Filters the rel value that is added to URL matches converted to links. * * @since 5.3.0 * * @param string $rel The rel value. * @param string $url The matched URL being converted to a link tag. */ $rel = apply_filters( 'make_clickable_rel', $rel, $url ); $rel_attr = $rel ? ' rel="' . esc_attr( $rel ) . '"' : ''; return $rel_attr; }