Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

Solved

Test site connection

Posted on 2009-05-11

2 solutions

Medium Priority

594 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

Comment

Question by:Pedro Chagas

[X]

Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

Help others & share knowledge
Earn cash & points
Learn & ask questions

Join The Community

7 Comments

LVL 39

Expert Comment

by:Roger Baklund

ID: 243601812009-05-11

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

LVL 7

Expert Comment

by:ycTIN

ID: 243604922009-05-11

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

LVL 39

Expert Comment

by:Roger Baklund

ID: 243605672009-05-11

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);

LVL 3

Assisted Solution

by:markh789

markh789 earned 640 total points

ID: 243634012009-05-12

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

LVL 3

Author Comment

by:Pedro Chagas

ID: 243696352009-05-12

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

LVL 39

Accepted Solution

by:Roger Baklund

Roger Baklund earned 960 total points

ID: 243697612009-05-12

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

LVL 3

Author Closing Comment

by:Pedro Chagas

ID: 315803612009-05-12

Both solutions work (@cxr and @markh789).

Featured Post

Question has a verified solution.

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

Display your dates as Today, Yesterday etc in PHP

Article by: Gary

Build an array called $myWeek which will hold the array elements Today, Yesterday and then builds up the rest of the week by the name of the day going back 1 week. (CODE) (CODE) Then you just need to pass your date to the function. If i…

Keeping Secrets with PHP

Article by: Ray

Since pre-biblical times, humans have sought ways to keep secrets, and share the secrets selectively. This article explores the ways PHP can be used to hide and encrypt information.

Validation of Email Addresses with Regular Expressions

Video by: Terry

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…