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Solved
Test site connection
Posted on 2009-05-11
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/tes
Warning: fsockopen() [function.fsockopen]: unable to connect to www.example.com/index/site.php:80 (php_network_getaddresses:
//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
<? $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/tes
Warning: fsockopen() [function.fsockopen]: unable to connect to www.example.com/index/site.php:80 (php_network_getaddresses:
//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
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7 Comments
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
http://php.net/manual/en/function.fsockopen.php#75388
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
if you need detect remote file, please use file_get_contents() or Curl
$return = @file_get_contents("http://google.com/");
var_dump($return);
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(arra
$page = file_get_contents($URL, 0, $ctx);
You can set a short timeout with file_get_contents() too, by using a stream context:
$ctx = stream_context_create(arra
$page = file_get_contents($URL, 0, $ctx);
Attached a code snippet, give it ago.
<?
function CheckWebsite($website_to_check) {
if (@fopen($website_to_check, "r")) {
return true;
} else {
return false;
}
}
?>
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(arra
$page = file_get_contents($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
I do this:
==========================
$url = "www.adwordsapi.blogspot.com";
$ctx = stream_context_create(arra
$page = file_get_contents($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
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, $ctx);
"www.adwordsapi.blogspot.com" is a host name, not an url. You must prepend it with "http://".
if($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';
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