如何使用 PHP 发送 OPTIONS 请求

有谁知道如何使用 PHP 发送“OPTIONS”请求。

我找不到执行此操作的curl setopt。

我正在使用 php 5.6.7

我已经弄清楚了 GET、POST、DELETE 和 PUT。只需要选项。

我已经尝试过以下 hd 的答案：

$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,"theurl");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "OPTIONS");
$r = curl_exec($ch);
print_r($http_response_header);
curl_close($ch);

我收到错误：

Undefined variable: http_response_header in C:\IIS_Emea\WebRoot\Site01\test\rest1.php on line 7

我如何得到结果？

<?php

$ch = curl_init();
curl_setopt_array($ch, array(
    CURLOPT_URL => 'http://stackoverflow.com/',
    CURLOPT_CUSTOMREQUEST => 'OPTIONS',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HEADER => true,
    CURLOPT_NOBODY => true,
    CURLOPT_VERBOSE => true,
));
$r = curl_exec($ch);

echo PHP_EOL.'Response Headers:'.PHP_EOL;
print_r($r);
curl_close($ch);

它能做什么：

1. CURLOPT_CUSTOMREQUEST => 'OPTIONS'- 定义HTTP请求方法。
2. CURLOPT_RETURNTRANSFER => true - tell curl_exec不是输出结果而是返回结果。
3. CURLOPT_HEADER => true- 返回标头。
4. CURLOPT_NOBODY => true- 不要归还尸体。
5. CURLOPT_VERBOSE => true- 仅用于调试，在生产时将其删除。它允许查看图书馆完成的请求和收到的响应。

脚本的输出如下所示

*   Trying 104.16.36.249...
* Connected to stackoverflow.com (104.16.36.249) port 80 (#0)
> OPTIONS / HTTP/1.1
Host: stackoverflow.com
Accept: */*

< HTTP/1.1 200 OK
< Date: Wed, 20 Apr 2016 09:02:44 GMT
< Content-Type: text/html; charset=utf-8
< Transfer-Encoding: chunked
< Connection: keep-alive
< Set-Cookie: __cfduid=d96e454843a81721eeb77cc4ebb49d2c91461142964; expires=Thu, 20-Apr-17 09:02:44 GMT; path=/; domain=.stackoverflow.com; HttpOnly
< Cache-Control: public, no-cache="Set-Cookie", max-age=60
< Expires: Wed, 20 Apr 2016 09:03:44 GMT
< Last-Modified: Wed, 20 Apr 2016 09:02:44 GMT
< Vary: *
< X-Frame-Options: SAMEORIGIN
< X-Request-Guid: a2f90416-9ec1-4ec9-b2d9-a69e22cc05d5
< Set-Cookie: prov=37be6386-6390-40fb-9f0a-42efdfcf2d71; domain=.stackoverflow.com; expires=Fri, 01-Jan-2055 00:00:00 GMT; path=/; HttpOnly
< Server: cloudflare-nginx
< CF-RAY: 29676b4517f92b21-WAW
< 
* Excess found in a non pipelined read: excess = 725 url = / (zero-length body)
* Connection #0 to host stackoverflow.com left intact

Response Headers:
HTTP/1.1 200 OK
Date: Wed, 20 Apr 2016 09:02:44 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: __cfduid=d96e454843a81721eeb77cc4ebb49d2c91461142964; expires=Thu, 20-Apr-17 09:02:44 GMT; path=/; domain=.stackoverflow.com; HttpOnly
Cache-Control: public, no-cache="Set-Cookie", max-age=60
Expires: Wed, 20 Apr 2016 09:03:44 GMT
Last-Modified: Wed, 20 Apr 2016 09:02:44 GMT
Vary: *
X-Frame-Options: SAMEORIGIN
X-Request-Guid: a2f90416-9ec1-4ec9-b2d9-a69e22cc05d5
Set-Cookie: prov=37be6386-6390-40fb-9f0a-42efdfcf2d71; domain=.stackoverflow.com; expires=Fri, 01-Jan-2055 00:00:00 GMT; path=/; HttpOnly
Server: cloudflare-nginx
CF-RAY: 29676b4517f92b21-WAW

您获得字符串形式的响应标头，并且需要解析它。但我想这超出了问题的范围。