PHP利用CURL实现HTTP GET和HTTP POST，用于HTTP请求，具体代码如下：

<?php
//初始化
$curl = curl_init();
//设置抓取的url
curl_setopt($curl, CURLOPT_URL, 'http://www.baidu.com');
//设置头文件的信息作为数据流输出,如果不想打印出http头，可以把这行去掉
curl_setopt($curl, CURLOPT_HEADER, 1);
//设置获取的信息以文件流的形式返回，而不是直接输出。
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
//执行命令
$data = curl_exec($curl);
//关闭URL请求
curl_close($curl);
//显示获得的数据
print_r($data);

HTTP POST:

<?php

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,$notify_url);
curl_setopt($ch, CURLOPT_POST, 1);


//curl_setopt($ch, CURLOPT_POSTFIELDS, "postvar1=value1&postvar2=value2&postvar3=value3");

$notifyData = [];

// In real life you should use something like:
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($notifyData));

// Receive server response ...
// curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_exec($ch);

curl_close($ch);

// echo $server_output;