您可以生成一个链接，使用该链接时，无需登录即可访问. 注意:任何人都可以通过该链接访问

<?php

require_once "google-api-php-client/vendor/autoload.php";
putenv("GOOGLE_APPLICATION_CREDENTIALS=googlecredentials-path-file.json");
$client = new Google_Client();
$client->useApplicationDefaultCredentials();
$client->setScopes(["https://www.googleapis.com/auth/drive.file"]);
try {
    $service = new Google_Service_Drive($client);
    $google_file = new Google_Service_Drive_DriveFile();

    $file_path = "buho.jpg";

    $google_file->setName($file_path);
    $google_file->setParents(["Google-Drive-folder-id"]);
    $google_file->setDescription("File uploaded from a PHP application");
    $google_file->setMimeType("image/jpeg");
    $result = $service->files->create($google_file, [
        "data" => file_get_contents($file_path),
        "mimeType" => "image/jpeg",
        "uploadType" => "media",
    ]);
    // Set permissions to create a shareable link
    $permission = new Google_Service_Drive_Permission([
        "type" => "anyone",
        "role" => "reader",
    ]);
    $service->permissions->create($result->id, $permission);

    // Get the shareable link
    $file = $service->files->get($result->id, ["fields" => "webViewLink"]);
    $shareableLink = $file->webViewLink;

    echo '<a href="' .
        $shareableLink .
        '" target="_blank">' .
        $result->name .
        "</a>";
} catch (Exception $e) {
    // handle exception
}

Download file from url

<?php
    // add your shareable link here as the parameter.
    $fileContent = file_get_contents($shareableLink);
    $localFilePath = "./save-to-file-here.jpeg"
    if ($fileContent !== false) {
        // Save the file locally
        $result = file_put_contents($localFilePath, $fileContent);

        if ($result !== false) {
            echo "File downloaded successfully and saved as $localFilePath";
        } else {
            echo "Error saving the file locally.";
        }
    } else {
      echo "Error downloading the file content.";
   }