PHP stream_context_create()作用和用法分析

作用：建立並返回一個文本資料流並應用各種選項，可用於fopen(),file_get_contents()等過程的逾時設定、Proxy 伺服器、請求方式、頭資訊設定的特殊過程。
函數原型：resource stream_context_create ([ array $options [, array $params ]] )
用法
例子一： 複製代碼 代碼如下:<?php
$opts = array( 'http-->array(
'method'=>"GET",
'header'=>"Accept-language: en\r\n" .
"Cookie: foo=bar\r\n"
)
);
$context = stream_context_create($opts);
/* Sends an http request to www.jb51.net
with additional headers shown above */
$fp = fopen('http://www.jb51.net', 'r', false, $context);
fpassthru($fp);
fclose($fp);
?>

例子二： 複製代碼 代碼如下:<?php
$opts = array( 'http-->array(
'method'=>"GET",
'header'=>"Accept-language: en\r\n" .
"Cookie: foo=bar\r\n"
)
);
$context = stream_context_create($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：
複製代碼 代碼如下:<?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://www.jb51.net', false, $context);
echo $data;
?>

例子四： 複製代碼 代碼如下:<?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\n";
$data .= "Content-Disposition: form-data; name=\"".$key."\"\n\n".$val."\n";
}
$data .= "--$boundary\n";
//Collect Filedata
foreach($files as $key => $file)
{
$fileContents = file_get_contents($file['tmp_name']);
$data .= "Content-Disposition: form-data; name=\"{$key}\"; filename=\"{$file['name']}\"\n";
$data .= "Content-Type: image/jpeg\n";
$data .= "Content-Transfer-Encoding: binary\n\n";
$data .= $fileContents."\n";
$data .= "--$boundary--\n";
}
$params = array('http' => array(
'method' => 'POST',
'header' => 'Content-Type: multipart/form-data; boundary='.$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://www.jb51.net", $postdata, $files);
?>