blocks|key|1072517|text|在PHP中使用这样的命令，您可以在它们前面加上一个@来禁止这样的警告。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1072518|@file_get_contents('http://somenotrealurl.com/notrealpage');|code-block|syntax|javascript|1072519|如果出现故障，file_get_contents()将返回FALSE，因此，如果您对照检查返回的结果，则可以处理该故障|1072520|$pageDocument+=+@file_get_contents('http://somenotrealurl.com/notrealpage');

if+($pageDocument+===+false)+{
++++//+Handle+error
}|1072521|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.file-get-contents.php^0|P|1|0|0|T|5|7|J|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|M|3|N|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

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

<pre><code>@file_get_contents('http://somenotrealurl.com/notrealpage');
</code></pre>

<a href="http://php.net/manual/en/function.file-get-contents.php" rel="noreferrer">file_get_contents()</a> returns <code>FALSE</code> if a failure occurs, so if you check the returned result against that then you can handle the failure

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

if ($pageDocument === false) {
 // Handle error
}
</code></pre>

blocks|key|1072539|text|您需要检查HTTP+response+code|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1072540|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');
}|code-block|syntax|javascript|1072541|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/HTTP/HTTP_response_codes^0|5|I|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You need to check the <a href="https://developer.mozilla.org/en-US/docs/HTTP/HTTP_response_codes" rel="noreferrer">HTTP response code</a>:

<pre><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');
}
</code></pre>

blocks|key|1072595|text|虽然file_get_contents非常简洁和方便，但为了更好地控制，我倾向于使用Curl库。下面是一个例子。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1072596|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);
}|code-block|syntax|javascript|1072597|entityMap^0|2|H|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

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

<pre><code>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-&gt;getMessage() . ' for ' . $url);
}
</code></pre>

blocks|key|858090|text|每次使用http包装器调用file_get_contents时，都会在本地范围内创建一个变量：$http_response_header|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|858091|此变量包含所有HTTP标头。这种方法比get_headers()函数更好，因为只执行一个请求。|858092|注意:2个不同的请求可能以不同的方式结束。例如，get_headers()将返回503，而file_get_contents()将返回200。您将获得正确的输出，但由于get_headers()调用中的503错误，您将不会使用它。|858093|function+getUrl($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'];|code-block|syntax|javascript|858094|这个方法还可以让你跟踪存储在不同变量中的少量请求头，因为如果你使用file_get_contents()，$http_response_header会在局部作用域中被覆盖。|858095|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/reserved.variables.httpresponseheader.php|1^0|D|H|1B|L|0|0|J|D|0|O|D|0|0|1H|L|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|Q|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|X]]]]

Each time you call <code>file_get_contents</code> with an http wrapper, a variable in local scope is created: <a href="http://www.php.net/manual/en/reserved.variables.httpresponseheader.php" rel="noreferrer">$http_response_header</a>

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

Note: 2 different requests can end differently. For example, <code>get_headers()</code> 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.

<pre><code>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' =&gt; $http_response_header,
 'content' =&gt; $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'];
</code></pre>

This aproach also alows you to have track of few request headers stored in different variables since if you use file_get_contents() <a href="http://www.php.net/manual/en/reserved.variables.httpresponseheader.php" rel="noreferrer">$http_response_header</a> is overwritten in local scope.

blocks|key|1072718|text|为了避免重复请求，就像Orbling对ynh的回答所评论的那样，你可以组合他们的回答。如果你一开始就得到了一个有效的响应，就使用它。如果不是，找出问题所在(如果需要)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1072719|$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
}|code-block|syntax|javascript|1072720|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/438971/orbling|1|https://stackoverflow.com/users/511781/ynh^0|B|7|0|J|3|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

To avoid double requests as commented by <a href="https://stackoverflow.com/users/438971/orbling">Orbling</a> on the answer of <a href="https://stackoverflow.com/users/511781/ynh">ynh</a> 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).

<pre><code>$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
}
</code></pre>

blocks|key|1072771|text|您可以将'ignore_errors‘=>+true添加到选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1072772|$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);|code-block|syntax|javascript|1072773|在这种情况下，您将能够读取来自服务器的响应。|1072774|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

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

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

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

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

<pre><code>file_get_contents('http://somenotrealurl.com/notrealpage');
</code></pre>

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?

<pre><code>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
</code></pre>

for example in zend you can say: <code>if ($request-&gt;isSuccessful())</code>

<pre><code>$client = New Zend_Http_Client();
$client-&gt;setUri('http://someurl.com/somepage');

$request = $client-&gt;request();

if ($request-&gt;isSuccessful()) {
 //do stuff with the result
}
</code></pre>

file_get_contents when url doesn't exist

服务器

我正在使用file_get_contents()访问一个URL。file_get_contents('http://somenotrealurl.com/notrealpage');如果URL不是真实的，它将返回此错误消息。我如何才能让它优雅地出错，这样我才能知道该页面不存在，并在不显示此错误消息的情况下采取相应的操作...

问url不存在时的file_get_contents
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