Find all links in a file and append query string

[middleman666]

Hi All,

I have a few ad hoc variables I put in the url like so:

http://mydomain.com/?var_one=this&var_two=that

I then save these as a string:

$Vars = 'var_one='.$_GET['var_one'].'&var_two='.$_GET['var_two'];

I then have a html file containing links e.g.

<a href="http://mydomain.com/dir/index.php">Link</a>

Is there a way I can find all links in this html and append the $Vars to the end of them?

And also take into account that the link may already have some queries e.g.

<a href="http://mydomain.com/dir/index.php?q=panda">Link</a>

Is this possible?

Cheers

[Installer]

Here's one way to do it:

// Assuming $_GET has been filtered for safety,
// constuct new query string:
$add_query = http_build_query($_GET);

$sxml = new SimpleXMLElement(file_get_contents($html_file));

$links = $sxml->xpath('body/a');
foreach ($links as $link) {
    if (parse_url($link['href'], PHP_URL_QUERY)) {  // If link contains a query
        $link['href'] .= '&' . $add_query;
    } else {
        $link['href'] .= '?' . $add_query;
    }
}

echo htmlspecialchars($sxml->asXML());

[middleman666]

Hey Installer,

Cheers for the reply.

Had a go using your code, but it doesn't seem to get past:
$sxml = new SimpleXMLElement(file_get_contents($html_file));

(I defined $html_file)

I check my php info and it says:

SimpleXML
Simplexml support enabled
Revision $Revision: 1.151.2.22 $

Schema support enabled

Any ideas why that may be? or is there another method I can use?

Thanks for your help!

[middleman666]

Ok, after hours of bad research I ended up using a regular expression I found and parts of your example code:

$add_query = http_build_query($_GET); 	
$html_file = 'test.html';
$html = file_get_contents($html_file);

$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>";
if(preg_match_all("/$regexp/siU", $html, $regs, PREG_SET_ORDER)) {

foreach($regs as $reg) {
	//href value
	$link = $reg[2];

	//If link contains a query 
	if (parse_url($link, PHP_URL_QUERY)) {  
		$mlink = $link.'&' . $add_query; 
	} else { 
		$mlink = $link.'?' . $add_query; 
	}

	//Repalce in html		
	$html = str_replace($link, $mlink, $html);
}

}
echo $html;

Does the job, but your way is probably a lot better if I could get simpleXML to work.

Is there away or using preg_replace rather than str_replace? I had a go, but couldn't get it to work.