Set the default stream context

# stream_context_set_default

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

stream_context_set_default — Set the default stream context

### 说明

function stream_context_set_default(array `$options`): resource

Set the default stream context which will be used whenever file operations (fopen(), file_get_contents(), etc...) are called without a context parameter. Uses the same syntax as stream_context_create().

### 参数

`options`

  The options to set for the default context.

  > 注意:

  > `options` must be an associative array of associative arrays in the format `$arr['wrapper']['option'] = $value`.

### 返回值

Returns the default stream context.

### 示例

示例 #1 stream_context_set_default() example

    <?php
    $default_opts = [
      'http' => [
        'method' => "GET",
        'header' => "Accept-language: en\r\n" .
                    "Cookie: foo=bar",
        'proxy'  => "tcp://10.54.1.39:8000",
      ]
    ];

    $default = stream_context_set_default($default_opts);

    /* Sends a regular GET request to proxy server at 10.54.1.39
     * For www.example.com using context options specified in $default_opts
     */
    readfile('http://www.example.com');
    ?>

### 参见

- stream_context_create() - 创建资源流上下文
- stream_context_get_default() - Retrieve the default stream context
- Listing of supported wrappers with context options (支持的协议和封装协议).

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