Php/docs/function.stream-context-get-default

• PHP Manual
• Stream 函数
• Retrieve the default stream context

stream_context_get_default

(PHP 5 >= 5.1.0, PHP 7)

stream_context_get_default — Retrieve the default stream context

说明

stream_context_get_default ([ array $options ] ) : resource

Returns the default stream context which is used whenever file operations (fopen(), file_get_contents(), etc...) are called without a context parameter. Options for the default context can optionally be specified with this function using the same syntax as stream_context_create().

参数

options

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

Note:

As of PHP 5.3.0, the stream_context_set_default() function can be used to set the default context.

返回值

A stream context resource.

范例

Example #1 Using stream_context_get_default()

<?php$default_opts = array(  'http'=>array(    'method'=>"GET",    'header'=>"Accept-language: en\r\n" .              "Cookie: foo=bar",    'proxy'=>"tcp://10.54.1.39:8000"  ));$alternate_opts = array(  'http'=>array(    'method'=>"POST",    'header'=>"Content-type: application/x-www-form-urlencoded\r\n" .              "Content-length: " . strlen("baz=bomb"),    'content'=>"baz=bomb"  ));$default = stream_context_get_default($default_opts);$alternate = stream_context_create($alternate_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');/* Sends a POST request directly to www.example.com * Using context options specified in $alternate_opts */readfile('http://www.example.com', false, $alternate);?>

参见

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