Sample code trying to show whether Zend Barcode depends on Zend Validator and/or Zend Service Manager.

composer.json

{
    "require": {
        "zendframework/zend-barcode": "@stable"
    }
}

service.php

<?php

require_once __DIR__ . '/vendor/autoload.php';

use Zend\Barcode\Barcode;

$barcodeOptions = array('text' => 'ZEND-FRAMEWORK');
$rendererOptions = array();

$renderer = Barcode::factory(
	'code39', 'image', $barcodeOptions, $rendererOptions
)->render();

# PHP Fatal error:  Class 'Zend\ServiceManager\AbstractPluginManager' not found
# in /home/olivier/tests/zend-barcode/vendor/zendframework/zend-barcode/Zend/Barcode/ObjectPluginManager.php
# on line 22

validator.php

<?php

require_once __DIR__ . '/vendor/autoload.php';

use Zend\Barcode\Barcode;

# In order not to require zend-servicemanager, we can instantiate the barcode and renderer
# directly. I called it convoluted in the issue, but it’s not, just different than the
# examples in the docs.

$barcodeOptions = array('text' => 'ZEND-FRAMEWORK');
$barcode = new Zend\Barcode\Object\Code39( $barcodeOptions );

$rendererOptions = array();
$renderer = new Zend\Barcode\Renderer\Image( $rendererOptions );

$renderer->setBarcode( $barcode )->render();

# PHP Fatal error:  Class 'Zend\Validator\Barcode' not found
# in /home/olivier/tests/zend-barcode/vendor/zendframework/zend-barcode/Zend/Barcode/Object/AbstractObject.php
# on line 1200