magento-module/Helper/Data.php

<?php

namespace Retailcrm\Retailcrm\Helper;

use Magento\Framework\App\Helper\AbstractHelper;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\App\Helper\Context;
use Magento\Store\Model\ScopeInterface;

class Data extends AbstractHelper
{
    protected $storeManager;
    protected $objectManager;

    const XML_PATH_RETAILCRM = 'retailcrm/';

    public function __construct(Context $context,
        ObjectManagerInterface $objectManager,
        StoreManagerInterface $storeManager
    ) {
        $this->objectManager = $objectManager;
        $this->storeManager  = $storeManager;
        parent::__construct($context);
    }

    public function getConfigValue($field, $storeId = null)
    {
        return $this->scopeConfig->getValue(
            $field, ScopeInterface::SCOPE_STORE, $storeId
        );
    }

    public function getGeneralConfig($code, $storeId = null)
    {
        return $this->getConfigValue(self::XML_PATH_RETAILCRM . $code, $storeId);
    }
    
    /**
    * Recursive array filter
    *
    * @param array $haystack input array
    *
    * @SuppressWarnings(PHPMD.StaticAccess)
    * @SuppressWarnings(PHPMD.ElseExpression)
    *
    * @return array
    */
    public function filterRecursive($haystack)
    {
        foreach ($haystack as $key => $value) {
            if (is_array($value)) {
                $haystack[$key] = self::filterRecursive($haystack[$key]);
            }

            if (is_null($haystack[$key])
                || $haystack[$key] === ''
                || count($haystack[$key]) == 0
            ) {
                unset($haystack[$key]);
            } elseif (!is_array($value)) {
                $haystack[$key] = trim($value);
            }
        }

        return $haystack;
    }
}