PHP使用Http Post请求发送Json对象数据代码解析

<?php
/
  PHP发送Json对象数据
 
  @param $url 请求url
  @param $jsonStr 发送的json字符串
  @return array
 /
function http_post_json($url, $jsonStr)
{
  $ch = curl_init();
  curl_set($ch, CURLOPT_POST, 1);
  curl_set($ch, CURLOPT_URL, $url);
  curl_set($ch, CURLOPT_POSTFIELDS, $jsonStr);
  curl_set($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_set($ch, CURLOPT_HTTPHEADER, array(
      'Content-Type: application/json; charset=utf-8',
      'Content-Length: ' . strlen($jsonStr)
    )
  );
  $response = curl_exec($ch);
  $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  curl_close($ch);
 
  return array($httpCode, $response);
}
 
$url = "http://52php.blogs.";
$jsonStr = json_encode(array('a' => 1, 'b' => 2, 'c' => 2));
list($returnCode, $returnContent) = http_post_json($url, $jsonStr);