我正在尝试将筛选器添加到the_content 将在帖子中查找所有图像并附加自定义附件元数据credit 对它。

以下是我的功能：

Adds the Credit field to attachment details page: （这很有效）

function attachment_field_credit( $field, $post ) {
    $field[ \'credit\' ] = array(
        \'label\' => \'Credit\',
        \'input\' => \'text\',
        \'value\' => get_post_meta( $post->ID, \'credit\', true ),
    );
    return $field;
}

Saves the Credit field: （这很有效）

function attachment_field_credit_save( $post, $attachment ) {
    if( isset( $attachment[ \'credit\' ] ) )
        update_post_meta( $post[ \'ID\' ], \'credit\', $attachment[ \'credit\' ] );
    return $post;
}

Search the content for all available images: （这很有效）

function find_images( $content ) {
    return preg_replace_callback( \'/(<\\s*img[^>]+)(src\\s*=\\s*"[^"]+")([^>]+>)/i\', array( $this, \'attach_image_credit\' ), $content );
}

Appends credit metadata to each image: （这不起作用）

function attach_image_credit( $images ) {
    global $post;
    $credit = get_post_meta( $post->ID, \'credit\', true );
    $replacement = $images[0] . $credit;
    return $replacement;
}

如果我更换$credit 具有的值<span>Hello World!</span> 文本将按预期显示在页面上。我的方式一定有问题get_the_meta 的值credit.

<小时>

UPDATE

如果我手动更换：

get_post_meta( $post->ID, \'credit\', true );

使用：

get_post_meta( 446, \'credit\', true );

它起作用了！所以我需要做的就是找出一种获取附件ID的方法。

$credit = get_post_meta( $post->ID /* Wrong ID! */, \'credit\', true );

function attach_image_credit( $images ) {
    $return = $images[0];

    // Get the image ID from the unique class added by insert to editor: "wp-image-ID"
    if ( preg_match( \'/wp-image-([0-9]+)/\', $return, $match ) ) {
        if ( $credit = get_post_meta( $match[1] /* Captured image ID */, \'credit\', true ) )
            $return .= $credit;
    }

    return $return;
}