PHP stream_context_create()作用和用法分析

作用：创建并返回一个文本数据流并应用各种选项，可用于fopen(),file_get_contents()等过程的超时设置、代理服务器、请求方式、头信息设置的特殊过程。
函数原型：resource stream_context_create ([ array $options [, array $params ]] )
用法

例子一：


代码如下:


<?php
$opts = array( 'http-->array(
'method'=>"GET",
'header'=>"Accept-language: en
" .
"Cookie: foo=bar
"
)
);
$context = stream_context_create($opts);
/* Sends an http request to
with additional headers shown above */
$fp = fopen('http://', 'r', false, $context);
fpassthru($fp);
fclose($fp);
?>



例子二：


代码如下:


<?php
$opts = array( 'http-->array(
'method'=>"GET",
'header'=>"Accept-language: en
" .
"Cookie: foo=bar
"
)
);
$context = stream_context_create($opts);
?>
You would setup the header this way:
<?php
$opts = array( 'http-->array(
'method'=>"GET",
'header'=>array("Accept-language: en",
"Cookie: foo=bar",
"Custom-Header: value")
)
);
$context = stream_context_create($opts);
?>



例子三：

代码如下:


<?php
$opts = array('http' => array('proxy' => 'tcp://127.0.0.1:8080', 'request_fulluri' => true));
$context = stream_context_create($opts);
$data = file_get_contents('http://', false, $context);
echo $data;
?>



例子四：


代码如下:


<?php
function do_post_request($url, $postdata, $files = null)
{
$data = "";
$boundary = "---------------------".substr(md5(rand(0,32000)), 0, 10);
//Collect Postdata
foreach($postdata as $key => $val)
{
$data .= "--$boundary
";
$data .= "Content-Disposition: form-data; name="".$key.""

".$val."
";
}
$data .= "--$boundary
";
//Collect Filedata
foreach($files as $key => $file)
{
$fileContents = file_get_contents($file['tmp_name']);
$data .= "Content-Disposition: form-data; name="{$key}"; filename="{$file['name']}"
";
$data .= "Content-Type: image/jpeg
";
$data .= "Content-Transfer-Encoding: binary

";
$data .= $fileContents."
";
$data .= "--$boundary--
";
}
$params = array('http' => array(
'method' => 'POST',
'header' => 'Content-Type: multipart/form-data; boundary='.$boundary,
'content' => $data
));
$ctx = stream_context_create($params);
$fp = fopen($url, 'rb', false, $ctx);
if (!$fp) {
throw new Exception("Problem with $url, $php_errormsg");
}
$response = @stream_get_contents($fp);
if ($response === false) {
throw new Exception("Problem reading data from $url, $php_errormsg");
}
return $response;
}
//set data (in this example from post)
//sample data
$postdata = array(
'name' => $_POST['name'],
'age' => $_POST['age'],
'sex' => $_POST['sex']
);
//sample image
$files['image'] = $_FILES['image'];
do_post_request("http://", $postdata, $files);
?>




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