Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Test site connection

Posted on 2009-05-11
7
Medium Priority
?
597 Views
Last Modified: 2012-05-06
I E's, I use this line of code for test the connection of a website:
<? $url_actual = "www.example.com";
$fp = fsockopen("$url_actual", 80, $errno, $errstr, 1); ?>

fsockopen returns if have connection or not.

Perhaps, if I use a address like www.example.com/index/site.php, the system return a error:
"
Warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/tags/public_html/teste2.php on line 3

Warning: fsockopen() [function.fsockopen]: unable to connect to www.example.com/index/site.php:80 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /home/tags/public_html/teste2.php on line 3"
//LINE3: $fp = fsockopen("$url_actual", 80, $errno, $errstr, 1);

fsockopen just read a pure domains or subdomains, they don't check url with domains+folder+file?

If fsockopen don´t work for check url's, what is the alternative for check if the url exists and have connection?

Regards, JC
0
Comment
Question by:Pedro Chagas
7 Comments
 
LVL 39

Expert Comment

by:Roger Baklund
ID: 24360181
fsockopen() is for connecting to a host, not to a resource (=web page). If you can connect, then you can send a HEAD request to check if a resource is available. See example code here:

http://php.net/manual/en/function.fsockopen.php#75388
0
 
LVL 7

Expert Comment

by:ycTIN
ID: 24360492
the function  of fsockopen is create the connection between PHP and server, so you only can be use IP,domain or sub-domain

if you need detect remote file, please use file_get_contents() or Curl

$return = @file_get_contents("http://google.com/");
var_dump($return);

Open in new window

0
 
LVL 39

Expert Comment

by:Roger Baklund
ID: 24360567
file_get_contents() can be used, but it reads the entire resouce, and it has a very long timeout by default. fsockopen() can easily be called with a short timeout, and by sending a HEAD request you don't need to read the entire page.

You can set a short timeout with file_get_contents() too, by using a stream context:

$ctx = stream_context_create(array('http'=>array('timeout'=>1)));
$page = file_get_contents($URL, 0, $ctx);
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 3

Assisted Solution

by:markh789
markh789 earned 640 total points
ID: 24363401
Attached a code snippet, give it ago.
<?
function CheckWebsite($website_to_check) {
   if (@fopen($website_to_check, "r")) {
       return true;
   } else {
       return false;
   }
}
?> 

Open in new window

0
 
LVL 3

Author Comment

by:Pedro Chagas
ID: 24369635
Hi @cxr, in your code how I can see the result, connect or not connect, what your code return:
I do this:
====================================
$url = "www.adwordsapi.blogspot.com";
$ctx = stream_context_create(array('http'=>array('timeout'=>1)));
$page = file_get_contents($URL, 0, $ctx);
echo $ctx;
====================================
The result in the browser is: "Resource id #1"

After your code I need do something like:
if (connect) { do something } else if (not connected) { do other thing }

With your code how I work with conditional "IF"?

Regards, JC
0
 
LVL 39

Accepted Solution

by:
Roger Baklund earned 960 total points
ID: 24369761
That code is not the best approach, I just wanted to show how you can set a short timeout for file_get_contents(). The $page variable contains the page, or false if the page was not found.

if($page===false) echo 'page is down';
else echo 'page is up';

Note that there is a difference between $url and $URL, variable names are case sensitive.

You must use @ to prevent error when the file is not found: @file_get_contents($url, 0, $ctx);

"www.adwordsapi.blogspot.com" is a host name, not an url. You must prepend it with "http://".
$url = "http://www.adwordsapi.blogspot.com";
$ctx = stream_context_create(array('http'=>array('timeout'=>1)));
$page = @file_get_contents($url, 0, $ctx);
if($page===false) 
  echo 'page is down'; 
else 
  echo 'page is up';

Open in new window

0
 
LVL 3

Author Closing Comment

by:Pedro Chagas
ID: 31580361
Both solutions work (@cxr and @markh789).
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I imagine that there are some, like me, who require a way of getting currency exchange rates for implementation in web project from time to time, so I thought I would share a solution that I have developed for this purpose. It turns out that Yaho…
Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Suggested Courses

879 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question