og:image 如何在这 3 个选项之间进行选择

Question

我试着编写这样的代码：

如果 post 没有缩略图，它会选择默认图像。
如果没有 ACF 图片则选择默认缩略图
如果有 ACF 图像，则使用它。

这是我的 og:image 脸书。

function insert_image_src_rel_in_head()
{
    global $post;
    if (!is_singular())
        return;
    if (!has_post_thumbnail($post->ID))
    {
        $default_image = "http://madmax.quebec/neufsvies/wp-content/uploads/2016/09/madmax.quebec_qaygerxdm814v-750x374.jpg";
        echo '<meta property="og:image" content="' . $default_image . '"/>';
    }
    elseif (!empty($temp_acfImage))
    {
        $temp_acfImage = wp_get_attachment_image_src(get_field('image_og'), 'facebook-thumbnail');
        echo '<meta property="og:image" content="' . esc_attr($temp_acfImage[0]) . '"/>';
    }
    else
    {
        $thumbnail_src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'facebook-thumbnail');
        echo '<meta property="og:image" content="' . esc_attr($thumbnail_src[0]) . '"/>';
    }
    echo "";
}

add_action('wp_head', 'insert_image_src_rel_in_head', 1);

Answer 1

尝试使用此代码：

<?php
function insert_image_src_rel_in_head()
{
    global $post;
    $img_src = '';
    $default_image = "http://madmax.quebec/neufsvies/wp-content/uploads/2016/09/madmax.quebec_qaygerxdm814v-750x374.jpg"; //default image src
    if (!is_singular())
        return;
    $acfImage = get_field('image_og', $post->ID);
    //if post has ACF 'image_og'
    if (!empty($acfImage))
    {
        $img_src = wp_get_attachment_image_src($acfImage, 'facebook-thumbnail');
    }
    //if post does't has ACF 'image_og' but has thumbnail
    else if (has_post_thumbnail($post->ID))
    {
        $img_src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'facebook-thumbnail')[0];
    }
    //if post does't has thumbnail and also does't has ACF 'image_og' then set a default image
    else
    {
        $img_src = $default_image;
    }

    ?>
    <meta property="og:image" content="<?php echo $img_src; ?>"/>
    <?php
}
add_action('wp_head', 'insert_image_src_rel_in_head', 5);
?>

wp_get_attachment_url it returns URI to uploaded attachment or "false" on failure; whereas wp_get_attachment_image_src it returns an array contains four values: the URL of the attachment image src, the width of the image file, the height of the image file, and a boolean. And wp_get_attachment_url only takes $attachment_id as param and > wp_get_attachment_image_src accept $attachment_id, $size.

代码未经测试，但应该可以工作。
希望这对您有所帮助！

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