file_get_contents when url doesn't exist

I'm using file_get_contents() to access a URL. 

file_get_contents('http://somenotrealurl.com/notrealpage');

If the URL is not real, it return this error message. How can I get it to error gracefully so that I know that the page doesn't exist and act accordingly without displaying this error message?

file_get_contents('http://somenotrealurl.com/notrealpage')
[function.file-get-contents]:
failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
in myphppage.php on line 3

for example in zend you can say: if ($request->isSuccessful())

$client = New Zend_Http_Client();
$client->setUri('http://someurl.com/somepage');


$request = $client->request();


if ($request->isSuccessful()) {
//do stuff with the result
}
100159 次浏览
小开

With such commands in PHP, you can prefix them with an @ to suppress such warnings.

@file_get_contents('http://somenotrealurl.com/notrealpage');

file_get_contents() returns FALSE if a failure occurs, so if you check the returned result against that then you can handle the failure

$pageDocument = @file_get_contents('http://somenotrealurl.com/notrealpage');


if ($pageDocument === false) {
// Handle error
}
小开
最佳答案

You need to check the HTTP response code:

function get_http_response_code($url) {
$headers = get_headers($url);
return substr($headers[0], 9, 3);
}
if(get_http_response_code('http://somenotrealurl.com/notrealpage') != "200"){
echo "error";
}else{
file_get_contents('http://somenotrealurl.com/notrealpage');
}
小开

While file_get_contents is very terse and convenient, I tend to favour the Curl library for better control. Here's an example.

function fetchUrl($uri) {
$handle = curl_init();


curl_setopt($handle, CURLOPT_URL, $uri);
curl_setopt($handle, CURLOPT_POST, false);
curl_setopt($handle, CURLOPT_BINARYTRANSFER, false);
curl_setopt($handle, CURLOPT_HEADER, true);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 10);


$response = curl_exec($handle);
$hlength  = curl_getinfo($handle, CURLINFO_HEADER_SIZE);
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
$body     = substr($response, $hlength);


// If HTTP response is not 200, throw exception
if ($httpCode != 200) {
throw new Exception($httpCode);
}


return $body;
}


$url = 'http://some.host.com/path/to/doc';


try {
$response = fetchUrl($url);
} catch (Exception $e) {
error_log('Fetch URL failed: ' . $e->getMessage() . ' for ' . $url);
}
小开

Each time you call file_get_contents with an http wrapper, a variable in local scope is created: $http_response_header

This variable contains all HTTP headers. This method is better over get_headers() function since only one request is executed.

Note: 2 different requests can end differently. For example, get_headers() will return 503 and file_get_contents() would return 200. And you would get proper output but would not use it due to 503 error in get_headers() call.

function getUrl($url) {
$content = file_get_contents($url);
// you can add some code to extract/parse response number from first header.
// For example from "HTTP/1.1 200 OK" string.
return array(
'headers' => $http_response_header,
'content' => $content
);
}


// Handle 40x and 50x errors
$response = getUrl("http://example.com/secret-message");
if ($response['content'] === FALSE)
echo $response['headers'][0];   // HTTP/1.1 401 Unauthorized
else
echo $response['content'];

This aproach also alows you to have track of few request headers stored in different variables since if you use file_get_contents() $http_response_header is overwritten in local scope.

小开

Simple and functional (easy to use anywhere):

function file_contents_exist($url, $response_code = 200)
{
$headers = get_headers($url);


if (substr($headers[0], 9, 3) == $response_code)
{
return TRUE;
}
else
{
return FALSE;
}
}

Example:

$file_path = 'http://www.google.com';


if(file_contents_exist($file_path))
{
$file = file_get_contents($file_path);
}
小开

To avoid double requests as commented by Orbling on the answer of ynh you could combine their answers. If you get a valid response in the first place, use that. If not find out what the problem was (if needed).

$urlToGet = 'http://somenotrealurl.com/notrealpage';
$pageDocument = @file_get_contents($urlToGet);
if ($pageDocument === false) {
$headers = get_headers($urlToGet);
$responseCode = substr($headers[0], 9, 3);
// Handle errors based on response code
if ($responseCode == '404') {
//do something, page is missing
}
// Etc.
} else {
// Use $pageDocument, echo or whatever you are doing
}
小开

You may add 'ignore_errors' => true to options:

$options = array(
'http' => array(
'ignore_errors' => true,
'header' => "Content-Type: application/json\r\n"
)
);
$context  = stream_context_create($options);
$result = file_get_contents('http://example.com', false, $context);

In that case you will be able to read a response from the server.

小开 
$url = 'https://www.yourdomain.com';

Normal

function checkOnline($url) {
$headers = get_headers($url);
$code = substr($headers[0], 9, 3);
if ($code == 200) {
return true;
}
return false;
}


if (checkOnline($url)) {
// URL is online, do something..
$getURL = file_get_contents($url);
} else {
// URL is offline, throw an error..
}

Pro

if (substr(get_headers($url)[0], 9, 3) == 200) {
// URL is online, do something..
}

Wtf level

(substr(get_headers($url)[0], 9, 3) == 200) ? echo 'Online' : echo 'Offline';

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