[SOLVED] Link check

[qbox]

Any way to check if link is valid or not with php?

[The Little Guy]

what type of link?

 

http://somesite.com/page.html

 

or

 

../page/page.html

 

or

 

/page/page.html

 

or all of the above?

[qbox]

http://www.thsite.com/images/image.jpeg

 

 

if you can tell me to check is site exist

http://www.thesite.com

[qbox]

I need to check is link valid

www.sitename.com.images.image.jpg

 

or site exist

www.sitename.com

[flyhoney]

This might help:

http://www.zend.com/zend/spotlight/php-link-validation1.php

[DarkWater]

This might help:

http://www.zend.com/zend/spotlight/php-link-validation1.php

 

That was written 7 years ago; the code looks pretty deprecated.

 

Anyway, what kind of validation do you mean?  Actually checking if it's online, or making sure it's just a valid URL.

[corbin]

I would just send a HEAD header...

 

-Open a connection to the remote server

HEAD /path/to/file.ext HTTP/1.1

Host: <host>

Connection: close

 

Then see if it returns a 200 status.  If it doesn't, something could be wrong (301 could be fine for example, but 404 is obviously not valid.)  If a connection couldn't be opened, it's obviously not a valid link.

[qbox]

I need to check if site exist or if link is broken or not.

Example

www.site.com/images/image.jpeg

I dont mean it is valid or not. I mean is it broken or not. The point is. If the link is ok if I clikc with mouse on it, it will open a picture file in my browser. If its broken (so the picture didnt exist on the server) i will receive in my browser error message. So I need some php code who will check if link is ok (file exist on the server and everithing is cool) or its broken

 

Please I must to make some solution on this one. I find a free source scripts on the web but they check a whole site for a broken or valid links. I need something simple, short, fast and useful script for checking broking links.

Thank you. 

[flyhoney]

Corbin, that is an interesting idea.  Any idea how to actually implement that?

[flyhoney]

http://us3.php.net/get_headers

 

I think that may be the answer.

[bgadberry]

I actually had to do this recently and the easiest way to check if an image exists remotely, I found, is the command

 

getimagesize

http://us3.php.net/getimagesize

 

An example would be:

 

//This will get the image size of the image, if its not here it returns an error.  the @ symbol will suppress the error.
if (@GetImageSize(www.site.com/images/image.jpeg))
{
  //do stuff here if it can get the image size of the image. 
}
else
{
  //do stuff here if its not there.
}

 

That will work locally as well if you use local paths as well.

[qbox]

I actually had to do this recently and the easiest way to check if an image exists remotely, I found, is the command

 

getimagesize

http://us3.php.net/getimagesize

 

An example would be:

 

//This will get the image size of the image, if its not here it returns an error.  the @ symbol will suppress the error.
if (@GetImageSize(www.site.com/images/image.jpeg))
{
  //do stuff here if it can get the image size of the image. 
}
else
{
  //do stuff here if its not there.
}

 

That will work locally as well if you use local paths as well.

 

This look to me like a good idea and I try it. But its really slow if a link is not correct.

[flyhoney]

Try using get_headers.  Do as corbin suggested and check the status.

 

<?php
$url = 'http://www.example.com';
$headers = get_headers($url);
if ($headers[0] != 'HTTP/1.1 200 OK') {
    //link is bad
}
?>

 

Note that status 301 is a permanent redirect and the link may still work.

[qbox]

Its 50% faster. With image check it need around 6 seconds to make the link check. With headers it need only 3 seconds. I will probably use this method (with headers check)

 

Thanks to all for the help.

[flyhoney]

Your dilemma interested me, so I wrote a class to test urls.  Maybe you or someone else could find it useful.

 

It works like so:

<?php
$url = new UrlInfo('http://www.google.com/intl/en_ALL/images/logo.gif');
echo $url->getStatus();
print_r($url->getHeaders());
echo $url->getHeader('Content-Length');
?>

 

prints something like this:

 

200
Array
(
    [0] => HTTP/1.0 200 OK
    [Content-Type] => image/gif
    [Last-Modified] => Wed, 07 Jun 2006 19:38:24 GMT
    [Expires] => Sun, 17 Jan 2038 19:14:07 GMT
    [Cache-Control] => public
    [Date] => Thu, 04 Dec 2008 22:49:50 GMT
    [server] => gws
    [Content-Length] => 8558
    [Connection] => Close
)
8558

 

So to use it to test links:

 

<?php
$url = 'http://www.example.com/images/image.jpg';
$url_info = new UrlInfo($url);
if ($url_info->getStatus() == 200) {
    echo $url . ' returned status: 200';
}
?>

 

and here is the class:

 

<?php
class UrlInfo {

private $url;
private $headers;
private $status;

// fetch headers for url
public function __construct($url = '') 
{
	$this->url = $url;

	if ($this->url) 
	{
		$this->headers = @get_headers($this->url, 1);
		if (!$this->headers)
		{
			$this->headers = array();
		}
		else
		{
			$this->getStatus();
		}
	}
}

public function getUrl() 
{
	return $this->url;
}

public function getHeaders() 
{
	return $this->headers;
}

public function getHeader($key) 
{
	if (isset($this->headers[$key]))
	{
		return $this->headers[$key];
	}
	else
	{
		return '';
	}
}

public function getStatus()
{
	if (!$this->status)
	{
		$status = trim(end(explode(' ', $this->headers[0], 2)));
		switch ($status)
		{
			case '200 OK':
				$this->status = 200;
				break;
			case '301 Moved permanently':
				$this->status = 301;
				break;
			case '302 Found':
				$this->status = 302;
				break;
			case '303 See Other':
				$this->status = 303;
				break;
			case '403 Forbidden':
				$this->status = 403;
				break;
			case '404 Not Found':
			default: 
				$this->status = 404;
		}
	}
	return $this->status;
}

}
?>

[qbox]

flyhoney this script helped me a lot. Thank you.

[qbox]

hmmm I receive error 403 Forbidden from a valid site address.

From my local server is ok. But when I upload to a web host server i receive error.

Any solution?

[premiso]

hmmm I receive error 403 Forbidden from a valid site address.

From my local server is ok. But when I upload to a web host server i receive error.

Any solution?

 

Most likely it realizes you are hotlinking to that image and the does not allow hotlinking.

[qbox]

Or the server block all http requesting