HTTP 请求和 file_get_content，获取响应代码

我正在尝试使用 file_get_contents和 stream_context_create一起发送 POST 请求。到目前为止我的代码:

    $options = array('http' => array(
'method'  => 'POST',
'content' => $data,
'header'  =>
"Content-Type: text/plain\r\n" .
"Content-Length: " . strlen($data) . "\r\n"
));
$context  = stream_context_create($options);
$response = file_get_contents($url, false, $context);

但是，当发生 HTTP 错误时，它会发出一个警告:

file_get_contents(...): failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request

然后返回 false。有没有办法:

  • 禁止显示警告(我计划在失败的情况下抛出自己的异常)
  • 从流中获取错误信息(至少是响应代码)
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小开
最佳答案

http://php.net/manual/en/reserved.variables.httpresponseheader.php

$context = stream_context_create(['http' => ['ignore_errors' => true]]);
$result = file_get_contents("http://example.com", false, $context);
var_dump($http_response_header);
小开

Adding few more lines to the accepted response to get the http code

function getHttpCode($http_response_header)
{
if(is_array($http_response_header))
{
$parts=explode(' ',$http_response_header[0]);
if(count($parts)>1) //HTTP/1.0 <code> <text>
return intval($parts[1]); //Get code
}
return 0;
}


@file_get_contents("http://example.com");
$code=getHttpCode($http_response_header);

to hide the error output both comments are ok, ignore_errors = true or @ (I prefer @)

小开

@file_get_contents and ignore_errors = true are not the same: the first doesn't return anything; the second suppresses error messages, but returns server response (e.g. 400 Bad request).

I use a function like this:

$result = file_get_contents(
$url_of_API,
false,
stream_context_create([
'http' => [
'content' => json_encode(['value1' => $value1, 'value2' => $value2]),
'header' => 'Authorization: Basic XXXXXXXXXXXXXXX',
'ignore_errors' => 1,
'method' => 'POST',
'timeout' => 10
]
])
);


return json_decode($result)->status;

It returns 200 (Ok) or 400 (Bad request).

It works perfectly and it's easier than cURL.

小开

None of the answers (including the one accepted by OP) actually satisfy the two requirements:

  • suppress a warning (I'm planning to throw my own exception in case of failure)
  • obtain the error information (at least, the response code) from the stream

Here's my take:

function fetch(string $method, string $url, string $body, array $headers = []) {
$context = stream_context_create([
"http" => [
// http://docs.php.net/manual/en/context.http.php
"method"        => $method,
"header"        => implode("\r\n", $headers),
"content"       => $body,
"ignore_errors" => true,
],
]);


$response = file_get_contents($url, false, $context);


/**
* @var array $http_response_header materializes out of thin air
*/


$status_line = $http_response_header[0];


preg_match('{HTTP\/\S*\s(\d{3})}', $status_line, $match);


$status = $match[1];


if ($status !== "200") {
throw new RuntimeException("unexpected response status: {$status_line}\n" . $response);
}


return $response;
}

This will throw for a non-200 response, but you can easily work from there, e.g. add a simple Response class and return new Response((int) $status, $response); if that fits your use-case better.

For example, to do a JSON POST to an API endpoint:

$response = fetch(
"POST",
"http://example.com/",
json_encode([
"foo" => "bar",
]),
[
"Content-Type: application/json",
"X-API-Key: 123456789",
]
);

Note the use of "ignore_errors" => true in the http context map - this will prevent the function from throwing errors for non-2xx status codes.

This is most likely the "right" amount of error-suppression for most use-cases - I do not recommend using the @ error-suppression operator, as this will also suppress errors like simply passing the wrong arguments, which could inadvertently hide a bug in calling code.

小开

I go to this page with kind of a different issue, so posting my answer. My problem was that I was just trying to suppress the warning notification and display a customized warning message for the user, so this simple and obvious fix helped me:

// Suppress the warning messages
error_reporting(0);


$contents = file_get_contents($url);
if ($contents === false) {
print 'My warning message';
}

And if needed, turn back error reporting after that:

// Enable warning messages again
error_reporting(-1);

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