I'm teaching myself some basic scraping and I've found that sometimes the URL's that I feed into my code return 404, which gums up all the rest of my code.
So I need a test at the top of the code to check if the URL returns 404 or not.
This would seem like a pretty straightfoward task, but Google's not giving me any answers. I worry I'm searching for the wrong stuff.
One blog recommended I use this:
$valid = @fsockopen($url, 80, $errno, $errstr, 30);
and then test to see if $valid if empty or not.
But I think the URL that's giving me problems has a redirect on it, so $valid is coming up empty for all values. Or perhaps I'm doing something else wrong.
I've also looked into a "head request" but I've yet to find any actual code examples I can play with or try out.
Suggestions? And what's this about curl?
This question is related to
php
http
validation
http-headers
http-status-code-404
As an additional hint to the great accepted answer:
When using a variation of the proposed solution, I got errors because of php setting 'max_execution_time'. So what I did was the following:
set_time_limit(120);
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_NOBODY, true);
$result = curl_exec($curl);
set_time_limit(ini_get('max_execution_time'));
curl_close($curl);
First I set the time limit to a higher number of seconds, in the end I set it back to the value defined in the php settings.
I found this answer here:
if(($twitter_XML_raw=file_get_contents($timeline))==false){
// Retrieve HTTP status code
list($version,$status_code,$msg) = explode(' ',$http_response_header[0], 3);
// Check the HTTP Status code
switch($status_code) {
case 200:
$error_status="200: Success";
break;
case 401:
$error_status="401: Login failure. Try logging out and back in. Password are ONLY used when posting.";
break;
case 400:
$error_status="400: Invalid request. You may have exceeded your rate limit.";
break;
case 404:
$error_status="404: Not found. This shouldn't happen. Please let me know what happened using the feedback link above.";
break;
case 500:
$error_status="500: Twitter servers replied with an error. Hopefully they'll be OK soon!";
break;
case 502:
$error_status="502: Twitter servers may be down or being upgraded. Hopefully they'll be OK soon!";
break;
case 503:
$error_status="503: Twitter service unavailable. Hopefully they'll be OK soon!";
break;
default:
$error_status="Undocumented error: " . $status_code;
break;
}
Essentially, you use the "file get contents" method to retrieve the URL, which automatically populates the http response header variable with the status code.
this is just and slice of code, hope works for you
$ch = @curl_init();
@curl_setopt($ch, CURLOPT_URL, 'http://example.com');
@curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1");
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
@curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$response = @curl_exec($ch);
$errno = @curl_errno($ch);
$error = @curl_error($ch);
$response = $response;
$info = @curl_getinfo($ch);
return $info['http_code'];
addendum;tested those 3 methods considering performance.
The result, at least in my testing environment:
Curl wins
This test is done under the consideration that only the headers (noBody) is needed. Test yourself:
$url = "http://de.wikipedia.org/wiki/Pinocchio";
$start_time = microtime(TRUE);
$headers = get_headers($url);
echo $headers[0]."<br>";
$end_time = microtime(TRUE);
echo $end_time - $start_time."<br>";
$start_time = microtime(TRUE);
$response = file_get_contents($url);
echo $http_response_header[0]."<br>";
$end_time = microtime(TRUE);
echo $end_time - $start_time."<br>";
$start_time = microtime(TRUE);
$handle = curl_init($url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($handle, CURLOPT_NOBODY, 1); // and *only* get the header
/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);
/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
// if($httpCode == 404) {
// /* Handle 404 here. */
// }
echo $httpCode."<br>";
curl_close($handle);
$end_time = microtime(TRUE);
echo $end_time - $start_time."<br>";
I found this answer here:
if(($twitter_XML_raw=file_get_contents($timeline))==false){
// Retrieve HTTP status code
list($version,$status_code,$msg) = explode(' ',$http_response_header[0], 3);
// Check the HTTP Status code
switch($status_code) {
case 200:
$error_status="200: Success";
break;
case 401:
$error_status="401: Login failure. Try logging out and back in. Password are ONLY used when posting.";
break;
case 400:
$error_status="400: Invalid request. You may have exceeded your rate limit.";
break;
case 404:
$error_status="404: Not found. This shouldn't happen. Please let me know what happened using the feedback link above.";
break;
case 500:
$error_status="500: Twitter servers replied with an error. Hopefully they'll be OK soon!";
break;
case 502:
$error_status="502: Twitter servers may be down or being upgraded. Hopefully they'll be OK soon!";
break;
case 503:
$error_status="503: Twitter service unavailable. Hopefully they'll be OK soon!";
break;
default:
$error_status="Undocumented error: " . $status_code;
break;
}
Essentially, you use the "file get contents" method to retrieve the URL, which automatically populates the http response header variable with the status code.
If your running php5 you can use:
$url = 'http://www.example.com';
print_r(get_headers($url, 1));
Alternatively with php4 a user has contributed the following:
/**
This is a modified version of code from "stuart at sixletterwords dot com", at 14-Sep-2005 04:52. This version tries to emulate get_headers() function at PHP4. I think it works fairly well, and is simple. It is not the best emulation available, but it works.
Features:
- supports (and requires) full URLs.
- supports changing of default port in URL.
- stops downloading from socket as soon as end-of-headers is detected.
Limitations:
- only gets the root URL (see line with "GET / HTTP/1.1").
- don't support HTTPS (nor the default HTTPS port).
*/
if(!function_exists('get_headers'))
{
function get_headers($url,$format=0)
{
$url=parse_url($url);
$end = "\r\n\r\n";
$fp = fsockopen($url['host'], (empty($url['port'])?80:$url['port']), $errno, $errstr, 30);
if ($fp)
{
$out = "GET / HTTP/1.1\r\n";
$out .= "Host: ".$url['host']."\r\n";
$out .= "Connection: Close\r\n\r\n";
$var = '';
fwrite($fp, $out);
while (!feof($fp))
{
$var.=fgets($fp, 1280);
if(strpos($var,$end))
break;
}
fclose($fp);
$var=preg_replace("/\r\n\r\n.*\$/",'',$var);
$var=explode("\r\n",$var);
if($format)
{
foreach($var as $i)
{
if(preg_match('/^([a-zA-Z -]+): +(.*)$/',$i,$parts))
$v[$parts[1]]=$parts[2];
}
return $v;
}
else
return $var;
}
}
}
Both would have a result similar to:
Array
(
[0] => HTTP/1.1 200 OK
[Date] => Sat, 29 May 2004 12:28:14 GMT
[Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux)
[Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
[ETag] => "3f80f-1b6-3e1cb03b"
[Accept-Ranges] => bytes
[Content-Length] => 438
[Connection] => close
[Content-Type] => text/html
)
Therefore you could just check to see that the header response was OK eg:
$headers = get_headers($url, 1);
if ($headers[0] == 'HTTP/1.1 200 OK') {
//valid
}
if ($headers[0] == 'HTTP/1.1 301 Moved Permanently') {
//moved or redirect page
}
Here is a short solution.
$handle = curl_init($uri);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($handle,CURLOPT_HTTPHEADER,array ("Accept: application/rdf+xml"));
curl_setopt($handle, CURLOPT_NOBODY, true);
curl_exec($handle);
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 200||$httpCode == 303)
{
echo "you might get a reply";
}
curl_close($handle);
In your case, you can change application/rdf+xml to whatever you use.
If you are looking for an easiest solution and the one you can try in one go on php5 do
file_get_contents('www.yoursite.com');
//and check by echoing
echo $http_response_header[0];
This function return the status code of an URL in PHP 7:
/**
* @param string $url
* @return int
*/
function getHttpResponseCode(string $url): int
{
$headers = get_headers($url);
return substr($headers[0], 9, 3);
}
Example:
echo getHttpResponseCode('https://www.google.com');
//displays: 200
<?php
$url= 'www.something.com';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.4");
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_TIMEOUT,10);
curl_setopt($ch, CURLOPT_ENCODING, "gzip");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$output = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $httpcode;
?>
As an additional hint to the great accepted answer:
When using a variation of the proposed solution, I got errors because of php setting 'max_execution_time'. So what I did was the following:
set_time_limit(120);
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_NOBODY, true);
$result = curl_exec($curl);
set_time_limit(ini_get('max_execution_time'));
curl_close($curl);
First I set the time limit to a higher number of seconds, in the end I set it back to the value defined in the php settings.
If your running php5 you can use:
$url = 'http://www.example.com';
print_r(get_headers($url, 1));
Alternatively with php4 a user has contributed the following:
/**
This is a modified version of code from "stuart at sixletterwords dot com", at 14-Sep-2005 04:52. This version tries to emulate get_headers() function at PHP4. I think it works fairly well, and is simple. It is not the best emulation available, but it works.
Features:
- supports (and requires) full URLs.
- supports changing of default port in URL.
- stops downloading from socket as soon as end-of-headers is detected.
Limitations:
- only gets the root URL (see line with "GET / HTTP/1.1").
- don't support HTTPS (nor the default HTTPS port).
*/
if(!function_exists('get_headers'))
{
function get_headers($url,$format=0)
{
$url=parse_url($url);
$end = "\r\n\r\n";
$fp = fsockopen($url['host'], (empty($url['port'])?80:$url['port']), $errno, $errstr, 30);
if ($fp)
{
$out = "GET / HTTP/1.1\r\n";
$out .= "Host: ".$url['host']."\r\n";
$out .= "Connection: Close\r\n\r\n";
$var = '';
fwrite($fp, $out);
while (!feof($fp))
{
$var.=fgets($fp, 1280);
if(strpos($var,$end))
break;
}
fclose($fp);
$var=preg_replace("/\r\n\r\n.*\$/",'',$var);
$var=explode("\r\n",$var);
if($format)
{
foreach($var as $i)
{
if(preg_match('/^([a-zA-Z -]+): +(.*)$/',$i,$parts))
$v[$parts[1]]=$parts[2];
}
return $v;
}
else
return $var;
}
}
}
Both would have a result similar to:
Array
(
[0] => HTTP/1.1 200 OK
[Date] => Sat, 29 May 2004 12:28:14 GMT
[Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux)
[Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
[ETag] => "3f80f-1b6-3e1cb03b"
[Accept-Ranges] => bytes
[Content-Length] => 438
[Connection] => close
[Content-Type] => text/html
)
Therefore you could just check to see that the header response was OK eg:
$headers = get_headers($url, 1);
if ($headers[0] == 'HTTP/1.1 200 OK') {
//valid
}
if ($headers[0] == 'HTTP/1.1 301 Moved Permanently') {
//moved or redirect page
}
addendum;tested those 3 methods considering performance.
The result, at least in my testing environment:
Curl wins
This test is done under the consideration that only the headers (noBody) is needed. Test yourself:
$url = "http://de.wikipedia.org/wiki/Pinocchio";
$start_time = microtime(TRUE);
$headers = get_headers($url);
echo $headers[0]."<br>";
$end_time = microtime(TRUE);
echo $end_time - $start_time."<br>";
$start_time = microtime(TRUE);
$response = file_get_contents($url);
echo $http_response_header[0]."<br>";
$end_time = microtime(TRUE);
echo $end_time - $start_time."<br>";
$start_time = microtime(TRUE);
$handle = curl_init($url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($handle, CURLOPT_NOBODY, 1); // and *only* get the header
/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);
/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
// if($httpCode == 404) {
// /* Handle 404 here. */
// }
echo $httpCode."<br>";
curl_close($handle);
$end_time = microtime(TRUE);
echo $end_time - $start_time."<br>";
With strager's code, you can also check the CURLINFO_HTTP_CODE for other codes. Some websites do not report a 404, rather they simply redirect to a custom 404 page and return 302 (redirect) or something similar. I used this to check if an actual file (eg. robots.txt) existed on the server or not. Clearly this kind of file would not cause a redirect if it existed, but if it didn't it would redirect to a 404 page, which as I said before may not have a 404 code.
function is_404($url) {
$handle = curl_init($url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);
/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);
/* If the document has loaded successfully without any redirection or error */
if ($httpCode >= 200 && $httpCode < 300) {
return false;
} else {
return true;
}
}
If you are looking for an easiest solution and the one you can try in one go on php5 do
file_get_contents('www.yoursite.com');
//and check by echoing
echo $http_response_header[0];
I found this answer here:
if(($twitter_XML_raw=file_get_contents($timeline))==false){
// Retrieve HTTP status code
list($version,$status_code,$msg) = explode(' ',$http_response_header[0], 3);
// Check the HTTP Status code
switch($status_code) {
case 200:
$error_status="200: Success";
break;
case 401:
$error_status="401: Login failure. Try logging out and back in. Password are ONLY used when posting.";
break;
case 400:
$error_status="400: Invalid request. You may have exceeded your rate limit.";
break;
case 404:
$error_status="404: Not found. This shouldn't happen. Please let me know what happened using the feedback link above.";
break;
case 500:
$error_status="500: Twitter servers replied with an error. Hopefully they'll be OK soon!";
break;
case 502:
$error_status="502: Twitter servers may be down or being upgraded. Hopefully they'll be OK soon!";
break;
case 503:
$error_status="503: Twitter service unavailable. Hopefully they'll be OK soon!";
break;
default:
$error_status="Undocumented error: " . $status_code;
break;
}
Essentially, you use the "file get contents" method to retrieve the URL, which automatically populates the http response header variable with the status code.
This function return the status code of an URL in PHP 7:
/**
* @param string $url
* @return int
*/
function getHttpResponseCode(string $url): int
{
$headers = get_headers($url);
return substr($headers[0], 9, 3);
}
Example:
echo getHttpResponseCode('https://www.google.com');
//displays: 200
I found this answer here:
if(($twitter_XML_raw=file_get_contents($timeline))==false){
// Retrieve HTTP status code
list($version,$status_code,$msg) = explode(' ',$http_response_header[0], 3);
// Check the HTTP Status code
switch($status_code) {
case 200:
$error_status="200: Success";
break;
case 401:
$error_status="401: Login failure. Try logging out and back in. Password are ONLY used when posting.";
break;
case 400:
$error_status="400: Invalid request. You may have exceeded your rate limit.";
break;
case 404:
$error_status="404: Not found. This shouldn't happen. Please let me know what happened using the feedback link above.";
break;
case 500:
$error_status="500: Twitter servers replied with an error. Hopefully they'll be OK soon!";
break;
case 502:
$error_status="502: Twitter servers may be down or being upgraded. Hopefully they'll be OK soon!";
break;
case 503:
$error_status="503: Twitter service unavailable. Hopefully they'll be OK soon!";
break;
default:
$error_status="Undocumented error: " . $status_code;
break;
}
Essentially, you use the "file get contents" method to retrieve the URL, which automatically populates the http response header variable with the status code.
With strager's code, you can also check the CURLINFO_HTTP_CODE for other codes. Some websites do not report a 404, rather they simply redirect to a custom 404 page and return 302 (redirect) or something similar. I used this to check if an actual file (eg. robots.txt) existed on the server or not. Clearly this kind of file would not cause a redirect if it existed, but if it didn't it would redirect to a 404 page, which as I said before may not have a 404 code.
function is_404($url) {
$handle = curl_init($url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);
/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);
/* If the document has loaded successfully without any redirection or error */
if ($httpCode >= 200 && $httpCode < 300) {
return false;
} else {
return true;
}
}
Here's a way!
<?php
$url = "http://www.google.com";
if(@file_get_contents($url)){
echo "Url Exists!";
} else {
echo "Url Doesn't Exist!";
}
?>
This simple script simply makes a request to the URL for its source code. If the request is completed successfully, it will output "URL Exists!". If not, it will output "URL Doesn't Exist!".
You can use this code too, to see the status of any link:
<?php
function get_url_status($url, $timeout = 10)
{
$ch = curl_init();
// set cURL options
$opts = array(CURLOPT_RETURNTRANSFER => true, // do not output to browser
CURLOPT_URL => $url, // set URL
CURLOPT_NOBODY => true, // do a HEAD request only
CURLOPT_TIMEOUT => $timeout); // set timeout
curl_setopt_array($ch, $opts);
curl_exec($ch); // do it!
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE); // find HTTP status
curl_close($ch); // close handle
echo $status; //or return $status;
//example checking
if ($status == '302') { echo 'HEY, redirection';}
}
get_url_status('http://yourpage.comm');
?>
Here is a short solution.
$handle = curl_init($uri);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($handle,CURLOPT_HTTPHEADER,array ("Accept: application/rdf+xml"));
curl_setopt($handle, CURLOPT_NOBODY, true);
curl_exec($handle);
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 200||$httpCode == 303)
{
echo "you might get a reply";
}
curl_close($handle);
In your case, you can change application/rdf+xml to whatever you use.
<?php
$url= 'www.something.com';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.4");
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_TIMEOUT,10);
curl_setopt($ch, CURLOPT_ENCODING, "gzip");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$output = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $httpcode;
?>
this is just and slice of code, hope works for you
$ch = @curl_init();
@curl_setopt($ch, CURLOPT_URL, 'http://example.com');
@curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1");
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
@curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$response = @curl_exec($ch);
$errno = @curl_errno($ch);
$error = @curl_error($ch);
$response = $response;
$info = @curl_getinfo($ch);
return $info['http_code'];
This will give you true if url does not return 200 OK
function check_404($url) {
$headers=get_headers($url, 1);
if ($headers[0]!='HTTP/1.1 200 OK') return true; else return false;
}
As strager suggests, look into using cURL. You may also be interested in setting CURLOPT_NOBODY with curl_setopt to skip downloading the whole page (you just want the headers).
If your running php5 you can use:
$url = 'http://www.example.com';
print_r(get_headers($url, 1));
Alternatively with php4 a user has contributed the following:
/**
This is a modified version of code from "stuart at sixletterwords dot com", at 14-Sep-2005 04:52. This version tries to emulate get_headers() function at PHP4. I think it works fairly well, and is simple. It is not the best emulation available, but it works.
Features:
- supports (and requires) full URLs.
- supports changing of default port in URL.
- stops downloading from socket as soon as end-of-headers is detected.
Limitations:
- only gets the root URL (see line with "GET / HTTP/1.1").
- don't support HTTPS (nor the default HTTPS port).
*/
if(!function_exists('get_headers'))
{
function get_headers($url,$format=0)
{
$url=parse_url($url);
$end = "\r\n\r\n";
$fp = fsockopen($url['host'], (empty($url['port'])?80:$url['port']), $errno, $errstr, 30);
if ($fp)
{
$out = "GET / HTTP/1.1\r\n";
$out .= "Host: ".$url['host']."\r\n";
$out .= "Connection: Close\r\n\r\n";
$var = '';
fwrite($fp, $out);
while (!feof($fp))
{
$var.=fgets($fp, 1280);
if(strpos($var,$end))
break;
}
fclose($fp);
$var=preg_replace("/\r\n\r\n.*\$/",'',$var);
$var=explode("\r\n",$var);
if($format)
{
foreach($var as $i)
{
if(preg_match('/^([a-zA-Z -]+): +(.*)$/',$i,$parts))
$v[$parts[1]]=$parts[2];
}
return $v;
}
else
return $var;
}
}
}
Both would have a result similar to:
Array
(
[0] => HTTP/1.1 200 OK
[Date] => Sat, 29 May 2004 12:28:14 GMT
[Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux)
[Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
[ETag] => "3f80f-1b6-3e1cb03b"
[Accept-Ranges] => bytes
[Content-Length] => 438
[Connection] => close
[Content-Type] => text/html
)
Therefore you could just check to see that the header response was OK eg:
$headers = get_headers($url, 1);
if ($headers[0] == 'HTTP/1.1 200 OK') {
//valid
}
if ($headers[0] == 'HTTP/1.1 301 Moved Permanently') {
//moved or redirect page
}
this is just and slice of code, hope works for you
$ch = @curl_init();
@curl_setopt($ch, CURLOPT_URL, 'http://example.com');
@curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1");
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
@curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$response = @curl_exec($ch);
$errno = @curl_errno($ch);
$error = @curl_error($ch);
$response = $response;
$info = @curl_getinfo($ch);
return $info['http_code'];
As strager suggests, look into using cURL. You may also be interested in setting CURLOPT_NOBODY with curl_setopt to skip downloading the whole page (you just want the headers).
This will give you true if url does not return 200 OK
function check_404($url) {
$headers=get_headers($url, 1);
if ($headers[0]!='HTTP/1.1 200 OK') return true; else return false;
}
this is just and slice of code, hope works for you
$ch = @curl_init();
@curl_setopt($ch, CURLOPT_URL, 'http://example.com');
@curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1");
@curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
@curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
@curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$response = @curl_exec($ch);
$errno = @curl_errno($ch);
$error = @curl_error($ch);
$response = $response;
$info = @curl_getinfo($ch);
return $info['http_code'];
If your running php5 you can use:
$url = 'http://www.example.com';
print_r(get_headers($url, 1));
Alternatively with php4 a user has contributed the following:
/**
This is a modified version of code from "stuart at sixletterwords dot com", at 14-Sep-2005 04:52. This version tries to emulate get_headers() function at PHP4. I think it works fairly well, and is simple. It is not the best emulation available, but it works.
Features:
- supports (and requires) full URLs.
- supports changing of default port in URL.
- stops downloading from socket as soon as end-of-headers is detected.
Limitations:
- only gets the root URL (see line with "GET / HTTP/1.1").
- don't support HTTPS (nor the default HTTPS port).
*/
if(!function_exists('get_headers'))
{
function get_headers($url,$format=0)
{
$url=parse_url($url);
$end = "\r\n\r\n";
$fp = fsockopen($url['host'], (empty($url['port'])?80:$url['port']), $errno, $errstr, 30);
if ($fp)
{
$out = "GET / HTTP/1.1\r\n";
$out .= "Host: ".$url['host']."\r\n";
$out .= "Connection: Close\r\n\r\n";
$var = '';
fwrite($fp, $out);
while (!feof($fp))
{
$var.=fgets($fp, 1280);
if(strpos($var,$end))
break;
}
fclose($fp);
$var=preg_replace("/\r\n\r\n.*\$/",'',$var);
$var=explode("\r\n",$var);
if($format)
{
foreach($var as $i)
{
if(preg_match('/^([a-zA-Z -]+): +(.*)$/',$i,$parts))
$v[$parts[1]]=$parts[2];
}
return $v;
}
else
return $var;
}
}
}
Both would have a result similar to:
Array
(
[0] => HTTP/1.1 200 OK
[Date] => Sat, 29 May 2004 12:28:14 GMT
[Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux)
[Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
[ETag] => "3f80f-1b6-3e1cb03b"
[Accept-Ranges] => bytes
[Content-Length] => 438
[Connection] => close
[Content-Type] => text/html
)
Therefore you could just check to see that the header response was OK eg:
$headers = get_headers($url, 1);
if ($headers[0] == 'HTTP/1.1 200 OK') {
//valid
}
if ($headers[0] == 'HTTP/1.1 301 Moved Permanently') {
//moved or redirect page
}
Here's a way!
<?php
$url = "http://www.google.com";
if(@file_get_contents($url)){
echo "Url Exists!";
} else {
echo "Url Doesn't Exist!";
}
?>
This simple script simply makes a request to the URL for its source code. If the request is completed successfully, it will output "URL Exists!". If not, it will output "URL Doesn't Exist!".
Source: Stackoverflow.com