How can I resolve the 'Class not found' error for DocumentProcessorServiceClient in PHP Document AI?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I'm following the official Document AI quickstart guide (https://cloud.google.com/document-ai/docs/samples/documentai-quickstart?hl=en) using PHP 8.4.3, but when I run the sample code I encounter the following error:

Uncaught Error: Class "Google\Cloud\DocumentAI\V1\DocumentProcessorServiceClient" not found

This is my index.php file:

PHP
<?php
//auth
$authpath="Authfile.json";
putenv("GOOGLE_APPLICATION_CREDENTIALS=".$authpath);


//load librarys

require_once 'vendor/autoload.php';
# Imports the Google Cloud client library

use Google\Cloud\DocumentAI\V1\DocumentProcessorServiceClient;
use Google\Cloud\DocumentAI\V1\RawDocument;


$projectId = 'myprojectid'; # Your Google Cloud Platform project ID
$location = 'us'; # Your Processor Location

$processor = 'c......1'; # Your Processor ID

# Create Client
$client = new DocumentProcessorServiceClient();

# Local File Path
$documentPath = 'Winnie_the_Pooh_3_Pages-1.pdf';

# Read in File Contents
$handle = fopen($documentPath, 'rb');
$contents = fread($handle, filesize($documentPath));
fclose($handle);

# Load File Contents into RawDocument
$rawDocument = new RawDocument([
    'content' => $contents,
    'mime_type' => 'application/pdf'
]);

# Fully-qualified Processor Name
$name = $client->processorName($projectId, $location, $processor);

# Make Processing Request
$response = $client->processDocument($name, [
    'rawDocument' => $rawDocument
]);

# Print Document Text
printf('Document Text: %s', $response->getDocument()->getText());

?>

I've confirmed that the autoloader is included, and Composer is used to load dependencies. I suspect the error is caused by a change in the library structure. Any guidance or fixes to resolve this error would be appreciated.

Comments 0

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

The error message indicates that PHP cannot find the Document AI client class, typically because the required library isn’t installed or loaded correctly.

Steps to Resolve

Install the Required Package

Make sure you've installed the Document AI PHP client library via Composer. Run this command in your project directory:
```
BASH
composer require google/cloud-document-ai
```
Check the Autoloader

Ensure that your vendor/autoload.php exists and is being included at the top of your code. This file is generated by Composer and is responsible for autoloading the required classes.
Verify Your Composer Setup
- Confirm that the library is listed in your composer.json file under the require key.
- Run composer install to make sure all dependencies are properly installed.

After performing these steps, the class Google\Cloud\DocumentAI\V1\DocumentProcessorServiceClient should be available, and your sample code should run without the "class not found" error.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by EclipseCaptain404 • 1 month ago

I figured it out, the code sample was out of date

PHP
use Google\Cloud\DocumentAI\V1\DocumentProcessorServiceClient;

is bad and no longer works.

PHP
use Google\Cloud\DocumentAI\V1\Client\DocumentProcessorServiceClient;

is what you need. apparently you need to add "\Client" after the v1 now for it to find it and according to this guide it applies to all clients but not all use items. just the clients also the way the client reads the file is also quite different now, this is what worked:

PHP
<?php
//auth
$authpath="your.json";
putenv("GOOGLE_APPLICATION_CREDENTIALS=$authpath");

//load library's
require_once 'vendor/autoload.php';

# Imports the Google Cloud client library
use Google\Cloud\DocumentAI\V1\Client\DocumentProcessorServiceClient;
use Google\Cloud\DocumentAI\V1\ProcessRequest;
use Google\Cloud\DocumentAI\V1\ProcessResponse;
use Google\Cloud\DocumentAI\V1\RawDocument;

$projectId = 'your project name'; # Your Google Cloud Platform project ID
$location = 'us'; # Your Processor Location
$processor = 'c2c7b6e91fc07b01'; # Your Processor ID
# Local File Path
$documentPath = 'Winnie_the_Pooh_3_Pages.pdf';

// Create a client.
$documentProcessorServiceClient = new DocumentProcessorServiceClient();

// Prepare the request message.
//processor
$pro="projects/".$projectId."/locations/".$location."/processors/".$processor;
//document
# Load File Contents into RawDocument
$rawDocument = new RawDocument(['content' => file_get_contents($documentPath),'mime_type' => 'application/pdf']);

$request = (new ProcessRequest())->setName($pro)->setRawDocument($rawDocument);

try {
    $response = $documentProcessorServiceClient->processDocument($request);
    printf('Response data: %s' . PHP_EOL, $response->serializeToJsonString());
} 
catch (ApiException $ex) 
{
    printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
}

?>

I also found out that if you get the error that it can't find the ADC
a work around is to add it in the client creation

PHP
$documentProcessorServiceClient = new DocumentProcessorServiceClient(['credentials' => "path to your json"]);

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How can I resolve the 'Class not found' error for DocumentProcessorServiceClient in PHP Document AI?

2 Answers

Steps to Resolve

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