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 = $client->request开发者_JAVA百科();
if ($request->isSuccessful()) {
//do stuff with the result
}
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');
}
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
}
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() $http_response_header is overwritten in local scope.
While file_get_contents
is very terse and convenient, I tend to favour the Curl library for better control. Here's an example.
function fetchUrl($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 ' . $url);
}
Simple and functional (easy to use anywhere):
function file_contents_exist($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);
}
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
}
You may add 'ignore_errors' => true to options:
$options = [
'http' => [
'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.
$url = 'https://www.yourdomain.com';
Normal
function checkOnline($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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