如何在wordpress中替换元标题和元描述?

时间:2016-01-05 14:11:57

标签: php wordpress add-filter

很抱歉,如果我的问题是基本的或愚蠢的,请帮我解决这个问题。我正在尝试在wordpress中动态更改<title><meta name="description" >标记。所以这就是我在function.php文件中尝试过的。

function changeMeta_2(){
    global $wpdb;
    $cur_url = $_SERVER['REQUEST_URI']; 
    $basename = pathinfo($cur_url);
    $ebasename = $basename['filename'];
    if(is_numeric($ebasename)) {
    $url = explode('/', $basename['dirname']);
    $basename = explode('.', $url[count($url)-2]);
    $ebasename = $basename[0];
    }
    $pageName = $ebasename;



    $arraylist_subcat  = array("car","bike","boat","xxxx","yyyy","zzz","mmmm");
    $arraylist_maincat = array("aus","ind","usa","uae");


    $category_id = get_term_by('slug',$pageName, 'category');   
    $category_parentid  = get_term_by('id', $category_id->parent, 'category');   
    $parent_slug =  $category_parentid->slug;



   if ( is_page()) {        
        if ( in_array($pageName,$arraylist_maincat) ) {         
                $metaTitle = 'Browse  '.$pageName.' | Some txt title | mysite.com';
                $metaDescription = 'some of custome blablaaaaa text description  '.$pageName.' some of custome blablaaaaa text description ';                               
                echo '<title>'.$metaTitle.'</title>';
                echo '<meta name="description" content="'.$metaDescription.'"/>';                   
        }
    }
}
add_action( 'wp_head', 'changeMeta_2' );

在上面的代码中,我试图更改与数组值匹配的term id的标题标签和元描述(in_array条件)。

一切正常,但问题是覆盖(替换)<title>标记附加在头部。它没有改变它附加。请有人帮我解决这个问题。

2 个答案:

答案 0 :(得分:1)

对于将来提出此问题的任何人:可以使用Yoast SEO plugin完成此功能。

然而,如果您确实想要自己做这件事......

要修改标题而不是wp_head挂钩,您需要使用实际允许修改标题的过滤器:wp_title

您可以/应该使用wp_head添加元描述(请参阅此处的文档:http://codex.wordpress.org/Meta_Tags_in_WordPress

另请注意有更简单的获取网页标题的方法,如下所述......

对于标题,您的代码看起来像这样:

function changeTitle($title, $sep, $seplocation){
    global $wpdb;

    // NOTE: This is the HARD way to get the page title, and is unreliable...
    $cur_url = $_SERVER['REQUEST_URI']; 
    $basename = pathinfo($cur_url);
    $ebasename = $basename['filename'];

    if(is_numeric($ebasename)) {
        $url = explode('/', $basename['dirname']);
        $basename = explode('.', $url[count($url)-2]);
        $ebasename = $basename[0];
    }

    $pageName = $ebasename;

    // NOTE: Why not get pagename this way?
    global $post;
    $pageName = $post->post_title;

    // or if you need the slug...
    $pageName = $post->post_slug;

    $arraylist_subcat  = array("car","bike","boat","xxxx","yyyy","zzz","mmmm");
    $arraylist_maincat = array("aus","ind","usa","uae");


    $category_id = get_term_by('slug',$pageName, 'category');   
    $category_parentid  = get_term_by('id', $category_id->parent, 'category');   
    $parent_slug =  $category_parentid->slug;



   if ( is_page()) {        
        if ( in_array($pageName,$arraylist_maincat) ) {         
                $title = 'Browse  '.$pageName.' | Some txt title | mysite.com';                 
        }
    }

    return $title;
}

add_action( 'wp_title', 'changeTitle', 10, 3 );

答案 1 :(得分:0)

自Wordpress v4.4.0起,文档标题的生成方式已更改。现在wp_get_document_title指示标题的生成方式:

/**
 * Displays title tag with content.
 *
 * @ignore
 * @since 4.1.0
 * @since 4.4.0 Improved title output replaced `wp_title()`.
 * @access private
 */
function _wp_render_title_tag() {
    if ( ! current_theme_supports( 'title-tag' ) ) {
        return;
    }

    echo '<title>' . wp_get_document_title() . '</title>' . "\n";
}

这是v5.4.2中的代码。以下是可用于操作标题标签的过滤器:

function wp_get_document_title() {
    /**
    * Filters the document title before it is generated.
    *
    * Passing a non-empty value will short-circuit wp_get_document_title(),
    * returning that value instead.
    *
    * @since 4.4.0
    *
    * @param string $title The document title. Default empty string.
    */
    $title = apply_filters( 'pre_get_document_title', '' );
    if ( ! empty( $title ) ) {
        return $title;
    }
    // --- snipped ---
    /**
    * Filters the separator for the document title.
    *
    * @since 4.4.0
    *
    * @param string $sep Document title separator. Default '-'.
    */
    $sep = apply_filters( 'document_title_separator', '-' );

    /**
    * Filters the parts of the document title.
    *
    * @since 4.4.0
    *
    * @param array $title {
    *     The document title parts.
    *
    *     @type string $title   Title of the viewed page.
    *     @type string $page    Optional. Page number if paginated.
    *     @type string $tagline Optional. Site description when on home page.
    *     @type string $site    Optional. Site title when not on home page.
    * }
    */
    $title = apply_filters( 'document_title_parts', $title );
    // --- snipped ---
    return $title;
}

因此,您可以通过两种方法来做到这一点。

第一个使用pre_get_document_title过滤器,它可以缩短标题的产生,因此如果您不打算对当前标题进行更改,则可以提高性能:

function custom_document_title( $title ) {
    return 'Here is the new title';
}
add_filter( 'pre_get_document_title', 'custom_document_title', 10 );

第二种方法是,在使用document_title_separator或{{1}之类的函数生成标题之后,使用document_title_partssingle_term_title钩子为标题和标题分隔符添加钩子,稍后在函数中执行},具体取决于页面和即将输出的内容:

post_type_archive_title