appwrite/docs/examples/1.6.x/server-php/examples/functions/delete-variable.md

<?php

use Appwrite\Client;
use Appwrite\Services\Functions;

$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

$functions = new Functions($client);

$result = $functions->deleteVariable(
    functionId: '<FUNCTION_ID>',
    variableId: '<VARIABLE_ID>'
);