curl发送json格式数据

<?php

$params = array(
    ‘par1‘ => ‘a‘,
    ‘par2‘ => 11,
);
$header = array("Content-type: application/json");// 注意header头，格式k:v
$arrParams = json_encode($params);

$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $arrParams);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);// curl函数执行的超时时间（包括连接到返回结束） 秒单位
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);// 连接上的时长 秒单位
curl_setopt($ch, CURLOPT_URL, $url);
$ret = curl_exec($ch);

$http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);// 对方服务器返回http code
curl_close($ch);

// deal $ret