appwrite/docs/examples/1.6.x/server-php/examples/databases/delete-attribute.md

<?php

use Appwrite\Client;
use Appwrite\Services\Databases;

$client = (new Client())
    ->setEndpoint('https://cloud.appwrite.io/v1') // Your API Endpoint
    ->setProject('<YOUR_PROJECT_ID>') // Your project ID
    ->setKey('<YOUR_API_KEY>'); // Your secret API key

$databases = new Databases($client);

$result = $databases->deleteAttribute(
    databaseId: '<DATABASE_ID>',
    collectionId: '<COLLECTION_ID>',
    key: ''
);