PHP-de JSON formatynda POST parametrleri bilen API

Bazen parametrler massiwler bolup biler. Bu ýagdaýda şeýle parametrler JSON-a ýygnamaly. Bir mysala göz aýlalyň. Bizde JSON formatyndaky massiwi gözleýän we bu massiwiň elementleriniň jemyny yzyna gaýtaryan aşakdaky API bolsun:

api.loc/index.php<?php
  echo array_sum(json_decode($_POST['json'], true));
?>

Geliň bu API-a sorag edeliň:

tst.loc/index.php<?php
  $url = 'http://api.loc/index.php';
  
  $curl = curl_init();
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($curl, CURLOPT_POST, 1);
  
  $arr  = [1, 2, 3, 4, 5];
  $json = json_encode($arr);
  $data = ['json' => $json];
  curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
  
  $res = curl_exec($curl);
  
  var_dump($res);
?>