我在我的一些项目中也有类似的需求，通过从其URL获取图像ID，然后使用wp_get_attachment_image 因为它将返回带有srcset属性的标记。

为了获取图像ID，我使用Gustavo Bordoni的助手，如下所示here.

function attachment_url_to_postid( $url ) {
    global $wpdb;

    $dir = wp_upload_dir();
    $path = $url;

    if ( 0 === strpos( $path, $dir[\'baseurl\'] . \'/\' ) ) {
        $path = substr( $path, strlen( $dir[\'baseurl\'] . \'/\' ) );
    }

    $sql = $wpdb->prepare(
        "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = \'_wp_attached_file\' AND meta_value = %s",
        $path
    );
    $post_id = $wpdb->get_var( $sql );
    if ( ! empty( $post_id ) ) {
        return (int) $post_id;
    }
}

$dir = wp_upload_dir();
$path = $url;

if ( 0 === strpos( $path, $dir[\'baseurl\'] . \'/\' ) ) {
    $path = substr( $path, strlen( $dir[\'baseurl\'] . \'/\' ) );
}

$sql = $wpdb->prepare(
    "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = \'_wp_attached_file\' AND meta_value = %s",
    $path
);
$post_id = $wpdb->get_var( $sql );
if ( ! empty( $post_id ) ) {
    return (int) $post_id;
}

这是包装纸：

function get_attachment_id_by_url( $url ) {
    $post_id = attachment_url_to_postid( $url );

    if ( ! $post_id ){
        $dir = wp_upload_dir();
        $path = $url;
        if ( 0 === strpos( $path, $dir[\'baseurl\'] . \'/\' ) ) {
            $path = substr( $path, strlen( $dir[\'baseurl\'] . \'/\' ) );
        }

        if ( preg_match( \'/^(.*)(\\-\\d*x\\d*)(\\.\\w{1,})/i\', $path, $matches ) ){
            $url = $dir[\'baseurl\'] . \'/\' . $matches[1] . $matches[3];
            $post_id = attachment_url_to_postid( $url );
        }
    }

    return (int) $post_id;
}

wp_get_attachment_image( $image_id, $args[\'desired_image_size_as_registered\'] );