WordPress 将图片下载到本地并将下载的图片添加到媒体库

/**
* 下载远程图片并添加到媒体库
* @param string $url 图片的URL地址
* @return int|false 成功返回媒体库中图片的ID，失败返回false
*/
function download_image_and_add_to_media_library($url) {
// 获取上传目录
$upload_dir = wp_upload_dir();
$upload_path = $upload_dir['path'];

// 获取文件名
$filename = basename($url);
$file_path = $upload_path . '/' . $filename;

// 判断文件是否已经存在
if (file_exists($file_path)) {
// 如果文件已经存在，直接返回媒体库中对应图片的ID
$attachment_id = attachment_url_to_postid($upload_dir['url'] . '/' . $filename);
if ($attachment_id) {
return $attachment_id;
}
}

// 下载图片并保存到本地
$response = wp_remote_get($url, array('timeout' => 300));
$body = wp_remote_retrieve_body($response);
$image = imagecreatefromstring($body);
if ($image === false) {
return false;
}
imagepng($image, $file_path);
imagedestroy($image);

// 添加到媒体库
$attachment_data = array(
'guid' => $upload_dir['url'] . '/' . $filename,
'post_mime_type' => wp_check_filetype($filename)['type'],
'post_title' => preg_replace('/\.[^.]+$/', '', $filename),
'post_status' => 'inherit'
);
$attachment_id = wp_insert_attachment($attachment_data, $file_path);
require_once(ABSPATH . 'wp-admin/includes/image.php');
$attachment_data = wp_generate_attachment_metadata($attachment_id, $file_path);
wp_update_attachment_metadata($attachment_id, $attachment_data);

// 返回媒体库中对应图片的ID
return $attachment_id;
}

// 假设你已经有了一个图片的 ID，比如 $image_id = 123。
$image_html = wp_get_attachment_image($image_id, 'full');
echo $image_html;