PHP Requires Chilkat v11.4.0+

Referencing a Pre-Uploaded File by file_id in an AI Request

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Some AI proviers have a Files API that lets you upload content once and then reference it later in generation requests using a file_id. This is especially useful for large documents, reuse across multiple prompts, or keeping inputs structured and separate from your prompt text.

This example demonstrates how to use a file_id in a request.

Chilkat2 PHP

<?php

use Chilkat2\Ai;
use Chilkat2\StringBuilder;

$success = false;

$success = false;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$ai = new Ai();

// The provider can be "openai", "google", "claude", "mistral", "deepseek", "xai", or any provider
// that supports referencing pre-uploaded files by a file_id (or file uri).
$ai->Provider = 'openai';

// Use your provider's API key.
$ai->ApiKey = 'MY_API_KEY';

// Choose a model.
$ai->Model = 'gpt-5.6-luna';

// See the following example showing how to upload a file
// Upload a File to an AI Provider (OpenAI, Google, Antropic, X)

// Use the file_id of the pre-uploaded file.
$file_id = 'file-5G2xncrEiHbVfYPRpFgP9c';
$ai->InputAddFileId($file_id, 'application/json');

$ai->InputAddText('Explain why Hamlet delays taking revenge, using only evidence from the file.');

// Ask the AI for text output.
try {
    $ai->Ask('text');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the text response.
$sbResponse = new StringBuilder();
$ai->GetOutputTextSb($sbResponse);
echo $sbResponse->GetAsString(), "\n";