stream_context_get_default

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

stream_context_get_default — Retrieve the default stream context

说明

stream_context_get_default(?array $options = null): 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, or null.

返回值

A stream context resource.

更新日志

版本	说明
8.0.0	`options` is now nullable.

示例

示例 #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
stream_context_set_default() - Set 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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备份地址：http://www.lvesu.com/blog/php/function.stream-context-get-default.php