好用的PHP Curl扩展工具Guzzle

项目中使用第三方接口时，我们可以用封装好的工具—-Guzzle。

Guzzle是一个PHP的 HTTP 客户端，用来轻而易举地发送请求，并集成到我们的 WEB 服务上。

接口简单：构建查询语句、POST 请求、分流上传下载大文件、使用 HTTP cookies、上传JSON 数据等等。
发送同步或异步的请求均使用相同的接口。
使用 PSR-7 接口来请求、响应、分流，允许你使用其他兼容的 PSR-7 类库与Guzzle共同开发。
抽象了底层的 HTTP 传输，允许你改变环境以及其他的代码，如：对 cURL 与PHP的流或 socket 并非重度依赖，非阻塞事件循环。
中间件系统允许你创建构成客户端行为。

Composer 安装

composer require guzzlehttp/guzzle 

简单的例子

创建客户端

use GuzzleHttp\Client;

$client = new Client([
    // Base URI is used with relative requests
    'base_uri' => 'http://httpbin.org',
    // You can set any number of default request options.
    'timeout'  => 2.0,
]);

发送请求

$response = $client->get('http://httpbin.org/get');
$response = $client->delete('http://httpbin.org/delete');
$response = $client->head('http://httpbin.org/get');
$response = $client->options('http://httpbin.org/get');
$response = $client->patch('http://httpbin.org/patch');
$response = $client->post('http://httpbin.org/post');
$response = $client->put('http://httpbin.org/put');

你可以创建一个请求，一切就绪后将请求传送给 client：

use GuzzleHttp\Psr7\Request;

$request = new Request('PUT', 'http://httpbin.org/put');
$response = $client->send($request, ['timeout' => 2]);

异步请求

$promise = $client->getAsync('http://httpbin.org/get');
$promise = $client->deleteAsync('http://httpbin.org/delete');
$promise = $client->headAsync('http://httpbin.org/get');
$promise = $client->optionsAsync('http://httpbin.org/get');
$promise = $client->patchAsync('http://httpbin.org/patch');
$promise = $client->postAsync('http://httpbin.org/post');
$promise = $client->putAsync('http://httpbin.org/put');

并发请求

use GuzzleHttp\Client;
use GuzzleHttp\Promise;

$client = new Client(['base_uri' => 'http://httpbin.org/']);

// Initiate each request but do not block
$promises = [
    'image' => $client->getAsync('/image'),
    'png'   => $client->getAsync('/image/png'),
    'jpeg'  => $client->getAsync('/image/jpeg'),
    'webp'  => $client->getAsync('/image/webp')
];

// Wait on all of the requests to complete.
$results = Promise\unwrap($promises);

// You can access each result using the key provided to the unwrap
// function.
echo $results['image']->getHeader('Content-Length');
echo $results['png']->getHeader('Content-Length');

上传数据

//Guzzle 为上传数据提供了一些方法。 你可以发送一个包含数据流的请求，将 body 请求参数设置成一个字符串、 fopen 返回的资源、或者一个 Psr\Http\Message\StreamInterface 的实例。

// Provide the body as a string.
$r = $client->request('POST', 'http://httpbin.org/post', [
    'body' => 'raw data'
]);

// Provide an fopen resource.
$body = fopen('/path/to/file', 'r');
$r = $client->request('POST', 'http://httpbin.org/post', ['body' => $body]);

// Use the stream_for() function to create a PSR-7 stream.
$body = \GuzzleHttp\Psr7\stream_for('hello!');
$r = $client->request('POST', 'http://httpbin.org/post', ['body' => $body]);
//上传 JSON 数据以及设置合适的头信息可以使用 json 请求参数这个简单的方式：

$r = $client->request('PUT', 'http://httpbin.org/put', [
    'json' => ['foo' => 'bar']
]);

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