<?php
use Appwrite\Client;
use Appwrite\Services\Project;
$client = (new Client())
->setEndpoint('https://<REGION>.cloud.appwrite.io/v1') // Your API Endpoint
->setProject('<YOUR_PROJECT_ID>') // Your project ID
->setKey('<YOUR_API_KEY>'); // Your secret API key
$project = new Project($client);
$result = $project->deleteVariable(
variableId: '<VARIABLE_ID>'
);```