(PHP ActiveX) 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.

Note: This example requires Chilkat v11.4.0 or greater.

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ActiveX for 32-bit and 64-bit Windows

Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

$success = 0;

$success = 0;

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

$ai = new COM("Chilkat.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-mini';

// 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.
$success = $ai->Ask('text');
if ($success == 0) {
    print $ai->LastErrorText . "\n";
    exit;
}

// Get the text response.
$sbResponse = new COM("Chilkat.StringBuilder");
$ai->GetOutputTextSb($sbResponse);
print $sbResponse->getAsString() . "\n";

?>