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PHP stream_context_create()作用和用法分析

2018-12-30 PHP 前端之家

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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：

<div class="codetitle"><a style="CURSOR: pointer" data="30361" class="copybut" id="copybut30361" onclick="doCopy('code30361')"> 代码如下:

<div class="codebody" id="code30361">
<?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.cc
with additional headers shown above /
$fp = fopen('//www.jb51.cc','r',false,$context);
fpassthru($fp);
fclose($fp);
?>

例子二：

<div class="codetitle"><a style="CURSOR: pointer" data="22075" class="copybut" id="copybut22075" onclick="doCopy('code22075')"> 代码如下:

<div class="codebody" id="code22075">
<?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：

<div class="codetitle"><a style="CURSOR: pointer" data="49" class="copybut" id="copybut49" onclick="doCopy('code49')"> 代码如下:

<div class="codebody" id="code49">
<?PHP
$opts = array('http' => array('proxy' => 'tcp://127.0.0.1:8080','request_fulluri' => true));
$context = stream_context_create($opts);
$data = file_get_contents('//www.jb51.cc',$context);
echo $data;
?>

例子四：

<div class="codetitle"><a style="CURSOR: pointer" data="39570" class="copybut" id="copybut39570" onclick="doCopy('code39570')"> 代码如下:

<div class="codebody" id="code39570">
<?PHP
function do_post_request($url,$postdata,$files = null)
{
$data = "";
$boundary = "---------------------".substr(md5(rand(0,32000)),10);
//Collect Postdata
foreach($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',$ctx);
if (!$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'] = $_FILES['image'];
do_post_request("//www.jb51.cc",$files);
?>

PHP stream_context_create