stream_context_create()

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

创建资源流上下文

说明

创建并返回一个资源流上下文，该资源流中包含了$options中提前设定的所有参数的值。

参数

必须是一个二维关联数组，格式如下：$arr['wrapper']['option']=$value。

默认是一个空数组。

必须是$arr['parameter']=$value格式的关联数组。请参考context parameters里的标准资源流参数列表。

返回值

上下文资源流，类型为resource。

更新日志

范例

使用stream_context_create()

参见

• stream_context_set_option() 对资源流、数据包或者上下文设置参数
• Listing of supported wrappers (支持的协议和封装协议)
• Context options (上下文（Context）选项和参数)

Something to keep in mind when creating SSL streams (using https://):

One would think - the proper way to create a stream options array, would be as follows: 

THAT IS THE WRONG WAY!!!
Take notice to the 3rd line: 'https' => array (
The CORRECT way, is as follows:

Notice, the NEW 3rd line: 'http' => array (
Now - keep this in mind - I spent several hours trying to trouble shoot my issue, when I finally stumbled upon this non-documented issue.
The complete code to post to a secure page is as follows: 

I big NOTE that i hope will help some one. Something that is not mentioned in the documentation, is that when php is compiled --with-curlwrappers,
So, instead of:

You would setup the header this way: 

This will work.

I spent a good five hours trying to figure this out, so hopefully it will save someone else some time.
When you are trying to download a file via ftp through an HTTP proxy note that the following will not be enough:

Your proxy will respond that authentication is required. You may scratch your head and think "but I'm providing authentication!"
The issue is that the 'header' value is only applicable to http connections. So to authenticate on a proxy, you first have to pull a file from HTTP, before the context is valid for using on FTP.

It's a bit roundabout, but it works. Note that the 'header' val in the ftp array is redundant, but I kept it in anyway.

When using the https protocol you'll have to make sure to set the right context options to use the full "power" of the ssl/tls encryption.

More information about those context options can be found at http://php.net/manual/en/context.ssl.php

I found the following code worked for me for POSTing some binary data to a remote server. I am putting it here since I could not find a quick solution to this by 'googling' or looking through this documentation. 
Disclaimer: I have no idea if this a 'good' solution, since I'm new to PHP, but it may just suit your needs as it did mine. I am assuming bad things will happen with very large files since the entire file is read into $fileContents. 
I am using PHP 5.2.8.
  $fileHandle = fopen("someImage.jpg", "rb");
  $fileContents = stream_get_contents($fileHandle);
  fclose($fileHandle);
  $params = array(
   'http' => array
   (
     'method' => 'POST',
     'header'=>"Content-Type: multipart/form-data\r\n",
     'content' => $fileContents
   )
  );
  $url = "http://somesite.somecompany.com?someParam=someValue";
  $ctx = stream_context_create($params);
  $fp = fopen($url, 'rb', false, $ctx);
  $response = stream_get_contents($fp);

Hi,you can create an array of parameters(what it's called a stream context),which can be transmitted each time you read or write a stream through a socket.In the below example:
$opts =array('http'=>arra('method'=>"GET",
'header'=>"Accept-language:en\r\n"."Cookie: foo=bar\r\n");
What you're actually doing is create a set of parameters(the protocol to be used,the request method,additional http headers and a cookie) which will be used each time you open a socket connection to request www.example.com.This saves a lot of time if you want to use these parameters (called a stream context) whenever you include them when making a request to www.example.com,instead of having to specify them over and over again.
Using the previous example,say you want to create a stream context,which sends a "Content-Type" http header and utilize it when making a request to www.example.com.Take a look:
$opts = array('http'=>array('method'=>"GET",
'header'=>"Content-Type: text/xml; charset=utf-8");
$context = stream_context_create($opts);
$fp = fopen('http://www.example.com','r',false,$context);
fpassthru($fp);
fclose($fp);
Now,when you make a request to www.example.com,the above http header will be included within the socket and transmitted to the server.Best of luck for you friends,Hossein

In addition to the context options mentioned above (appendix N), lower down context options for sockets can be found in appendix P - http://www.php.net/manual/en/transports.php

In some cases, set a header option as an array, and not a string, depending on server configuration.

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