如何从 url 以编程方式设置特色图片?

How to set featured image programmatically from url?

我有一些 post 个 ID,我想设置这些 post 个来自相同 url 的精选图片。

这是我添加的 post 代码:

$catid = get_cat_ID("XX Cat");

$my_post = array(); 
$my_post['post_title'] = $title; 
$my_post['post_content'] = $description; 
$my_post['post_status'] = 'publish'; 
$my_post['post_author'] = 1; 
$my_post['post_category'] = array( $catid ); 

$post_id = wp_insert_post( $my_post );

示例:post_id = 1 我想将特色图片设置为:example.com/image.png

我该怎么做?

您可以将媒体库中的图像设置为 post 精选缩略图。要在您的媒体库中添加图片,您需要将其上传到您的服务器。

试试这个代码:

// Add Featured Image to Post
$image_url        = 'http://s.wordpress.org/style/images/wp-header-logo.png'; // Define the image URL here
$image_name       = 'wp-header-logo.png';
$upload_dir       = wp_upload_dir(); // Set upload folder
$image_data       = file_get_contents($image_url); // Get image data
$unique_file_name = wp_unique_filename( $upload_dir['path'], $image_name ); // Generate unique name
$filename         = basename( $unique_file_name ); // Create image file name

// Check folder permission and define file location
if( wp_mkdir_p( $upload_dir['path'] ) ) {
  $file = $upload_dir['path'] . '/' . $filename;
} else {
  $file = $upload_dir['basedir'] . '/' . $filename;
}

// Create the image  file on the server
file_put_contents( $file, $image_data );

// Check image file type
$wp_filetype = wp_check_filetype( $filename, null );

// Set attachment data
$attachment = array(
    'post_mime_type' => $wp_filetype['type'],
    'post_title'     => sanitize_file_name( $filename ),
    'post_content'   => '',
    'post_status'    => 'inherit'
);

// Create the attachment
$attach_id = wp_insert_attachment( $attachment, $file, $post_id );

// Include image.php
require_once(ABSPATH . 'wp-admin/includes/image.php');

// Define attachment metadata
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );

// Assign metadata to attachment
wp_update_attachment_metadata( $attach_id, $attach_data );

// And finally assign featured image to post
set_post_thumbnail( $post_id, $attach_id );

ref url : http://www.wpexplorer.com/wordpress-featured-image-url/

根据您的要求修改: 或者该目的忽略 WordPress 标准并将所有 post 单个图像上传到您的自定义文件夹,并将此图像路径或直接外部图像 url 添加到 post 作为额外属性元字段以及何时在您的主题上显示 post 然后只需在 post id 的帮助下使用您的 img。 演示代码: 用于设置图像

<?php
    update_post_meta ( 7, 'imgkey', 'www.url.path' );//7 is post id
?>

用于在您要显示的主题页面上获取图像

<?php
    $img_value = get_post_meta( get_the_ID(), 'imgkey', true );
?>
<img src="<?php echo $img_value?>">

请注意,如果您是 WordPress post 自定义元字段的新手,请阅读本文: https://codex.wordpress.org/Custom_Fields

关于自定义字段的非官方文章:https://premium.wpmudev.org/blog/creating-custom-fields-manually

如果您必须加载图像然后指定为 post 的缩略图,更快的方法是使用 media_sideload_image 然后 set_post_thumbnail

https://developer.wordpress.org/reference/functions/media_sideload_image/

$url     = "http://url-of-the-image.jpg";
$post_id = [post id]
$desc    = "image description";

$image = media_sideload_image( $url, $post_id, $desc,'id' );

set_post_thumbnail( $post_id, $image );

只是为了补充@Naraj 的回答,如果您在外部文件中工作,请记住添加:

require_once(ABSPATH . 'wp-admin/includes/media.php');
require_once(ABSPATH . 'wp-admin/includes/file.php');
require_once(ABSPATH . 'wp-admin/includes/image.php');

如果您不添加,您将收到一条错误消息,指出 media_sideload_image 未定义。