PHP：guzzlehttp/guzzle发送同步和异步网络请求

composer require guzzlehttp/guzzle

<?php
require 'vendor/autoload.php';
use GuzzleHttp\Client;
$client = new Client();
$response = $client->get('http://httpbin.org/get', [
    'query' => [
        'name' => 'Tom'
    ]
]);
echo $response->getStatusCode(); // 200
$content = $response->getBody()->getContents();
print_r($content);

<?php
require 'vendor/autoload.php';
use GuzzleHttp\Client;
$client = new Client();
$response = $client->post('http://httpbin.org/post', [
    'json' => [
        'name' => 'Tom'
    ]
]);
echo $response->getStatusCode(); // 200
$content = $response->getBody()->getContents();
print_r($content);

<?php
require 'vendor/autoload.php';
use GuzzleHttp\Client;
$client = new Client();
$promise = $client->getAsync('http://httpbin.org/get', [
    'query' => [
        'name' => 'Tom'
    ]
])->then(function ($response) {
    if ($response->getStatusCode() == 200) {
        echo $response->getBody()->getContents();
    }
});
// 如果不等待执行，则程序结束
$promise->wait();