<?php
namespace CustommoduleReviewRatingBlock;

class HomehorizontalWidget extends MagentoFrameworkViewElementTemplate
{
protected $_helper;
protected $jsonHelper;


public function __construct(
    MagentoFrameworkViewElementTemplateContext $context,
    array $data = [],
    CustommoduleReviewRatingHelperData $helper,
    MagentoFrameworkJsonHelperData $jsonHelper
) {
    parent::__construct($context, $data);

    $this->_helper = $helper;
    $this->jsonHelper = $jsonHelper;
}

  .................

 public function get_reviews_data( $url ){
        $dataResponse = $this->getDataFromApi($url);
        return $dataResponse['data']['reviews'];
 }

    public function getDataFromApi($url)
    {

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
        curl_setopt($ch, CURLOPT_TIMEOUT, 5);
        $data = curl_exec($ch);
        $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        $decodedData = $this->jsonHelper->jsonDecode($data);

        return ($httpcode>=200 && $httpcode<300) ? $decodedData : false;

    }

$url = "http://website.com/api?url";

       $reviewsData = $this->get_reviews_data( $url );
       echo "<pre>";
       print_r( $reviewsData );
       echo "</pre>";
?>

public function getDataFromApi($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    $data = curl_exec($ch);
    $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    if(is_array($data) && !empty($data)) {
        $decodedData = $this->jsonHelper->jsonDecode($data);
    }else {
        $data = (array) $data;
        $decodedData = $this->jsonHelper->jsonDecode($data);
    }

    return ($httpcode>=200 && $httpcode<300) ? $decodedData : false;

}