Just started playing with PHP Simple HTML DOM Parser and I see from PHP Simple HTML DOM Parser > Modify Fetched Links that it should be possible to find just the relative links to process.
My code so far:
<?php
include('phpsimpledom/simple_html_dom.php');
$html = file_get_html('phpimport.html');
// to fetch all hyperlinks from a webpage
$links = array();
foreach($html->find('a') as $a) {
$links[] = $a->href;
}
echo '<pre>', print_r($links, 1), '</pre>';
This prints out all the links and I only want the relative links
As your going through the links, check the href doesn't start with http:// or https:// before you add them to the list, this uses preg_match() to check it...
foreach($html->find('a') as $a) {
if ( preg_match("/^https?:\/\//i", $a->href) === 0) {
$links[] = $a->href;
}
}
Related
I have a program that removes certain pages from a web; i want to then traverse the remaining pages and "unlink" any links to those removed pages. I'm using simplehtmldom. My function takes a source page ($source) and an array of pages ($skipList). It finds the links, and I'd like to then manipulate the dom to convert the element into the $link->innertext, but I don't know how. Any help?
function RemoveSpecificLinks($source, $skipList) {
// $source is the html source file;
// $skipList is an array of link destinations (hrefs) that we want unlinked
$docHtml = file_get_contents($source);
$htmlObj = str_get_html($docHtml);
$links = $htmlObj->find('a');
if (isset($links)) {
foreach ($links as $link) {
if (in_array($link->href, $skipList)) {
$link->href = ''; // Should convert to simple text element
}
}
}
$docHtml = $htmlObj->save();
$htmlObj->clear();
unset($htmlObj);
return($docHtml);
}
I have never used simplehtmldom, but this is what I think should solve your problem:
function RemoveSpecificLinks($source, $skipList) {
// $source is the HTML source file;
// $skipList is an array of link destinations (hrefs) that we want unlinked
$docHtml = file_get_contents($source);
$htmlObj = str_get_html($docHtml);
$links = $htmlObj->find('a');
if (isset($links)) {
foreach ($links as $link) {
if (in_array($link->href, $skipList)) {
$link->outertext = $link->plaintext; // THIS SHOULD WORK
// IF THIS DOES NOT WORK TRY:
// $link->outertext = $link->innertext;
}
}
}
$docHtml = $htmlObj->save();
$htmlObj->clear();
unset($htmlObj);
return($docHtml);
}
Please provide me some feedback as if this worked or not, also specifying which method worked, if any.
Update: Maybe you would prefer this:
$link->outertext = $link->href;
This way you get the link displayed, but not clickable.
Im parsing html from some a page, to get a list of the outgoing, i want to split them in two - the ones with the rel="nofollow" / rel="nofollow me" / rel="me nofollow" element and the ones with with out those expressions.
At the moment im using the code bellow parsed using - PHP Simple HTML DOM Parser
$html = file_get_html("$url");
foreach($html->find('a') as $element) {
echo $element->href; // THE LINK
}
but im not quite sure how to implement it, any ideas ?
Try using something like this :
$html = file_get_html("$url");
// Creating array for storing links
$arrayLinks = array(
"nofollow" => array(),
"others" => array()
);
foreach($html->find('a') as $element) {
// Search for "nofollow" expression with no case-sensitive (i flag)
if(preg_match('#nofollow#i', $element->rel)) {
$arrayLinks["nofollow"][] = $element->href;
}
else {
$arrayLinks["others"][] = $element->href;
}
}
// Display the array
echo "<pre>";
print_r($arrayLinks);
echo "</pre>";
Do a regexp on $element->rel I guess
I want to rewrite/mask all external url in my article and also add nofollow and target="_blank". So that original link to the external site is get encrypted/ masked/ rewritten.
For example:
original link: www.google.com
rewrite it to: www.mydomain.com?goto=google.com
There is a plugin for joomla which rewrite external link: rewrite plugin.
But I am not using joomla. Please have a look at above plugin, It does exactly what I am looking for.
What I want?
$article = "hello this is example article I want to replace all external link http://google.com";
$host = substr($_SERVER['HTTP_HOST'], 0, 4) == 'www.' ? substr($_SERVER['HTTP_HOST'], 0) : $_SERVER['HTTP_HOST'];
if (thisIsNotMyWebsite){
replace external url
}
You can use DOMDocument to parse and traverse the document.
function rewriteExternal($html) {
// The url for your redirection script
$prefix = 'http://www.example.com?goto=';
// a regular expression to determine if
// this link is within your site, edit for your
// domain or other needs
$is_internal = '/(?:^\/|^\.\.\/)|example\.com/';
$dom = new DOMDocument();
// Parse the HTML into a DOM
$dom->loadHTML($html);
$links = $dom->getElementsByTagName('a');
foreach ($links as $link) {
$href = $link->getAttribute('href');
if (!preg_match($is_internal, $href)) {
$link->getAttributeNode('href')->value = $prefix . $href;
$link->setAttributeNode(new DOMAttr('rel', 'nofollow'));
$link->setAttributeNode(new DOMAttr('target', '_blank'));
}
}
// returns the updated HTML or false if there was an error
return $dom->saveHTML();
}
This approach will be much more reliable than using a regular expression based solution since it actually parses the DOM for you instead of relying on a often-fragile regex.
something like:
<?php
$html ='1224 google 567';
$tracking_string = 'http://example.com/track.php?url=';
$html = preg_replace('#(<a[^>]+href=")(http|https)([^>" ]+)("?[^>]*>)#is','\\1'.$tracking_string.'\\2\\3\\4',$html);
echo $html;
in action here: http://codepad.viper-7.com/7BYkoc
--my last update
<?php
$html =' 1224 google 567';
$tracking_string = 'http://example.com/track.php?url=';
$html = preg_replace('#(<a[^>]+)(href=")(http|https)([^>" ]+)("?[^>]*>)#is','\\1 nofollow target="_blank" \\2'.$tracking_string.'\\3\\4\\5',$html);
echo $html;
http://codepad.viper-7.com/JP8sUk
I am a php newb but I am pretty sure this will be hard to accomplish and very server consuming. But I want to ask, get the opinion of much smarter users than myself.
Here is what I am trying to do:
I have a list of URL's, an array of URL's actually.
For each URL, I want to count the outgoing links - which DO NOT HAVE REL="nofollow" attribute - on that page.
So in a way, I'm afraid I'll have to make php load the page and preg match using regular expressions all the links?
Would this work if I'd had lets say 1000 links?
Here is what I am thinking, putting it in code:
$homepage = file_get_contents('http://www.site.com/');
$homepage = htmlentities($homepage);
// Do a preg_match for http:// and count the number of appearances:
$urls = preg_match();
// Do a preg_match for rel="nofollow" and count the nr of appearances:
$nofollow = preg_match();
// Do a preg_match for the number of "domain.com" appearances so we can subtract the website's internal links:
$internal_links = preg_match();
// Substract and get the final result:
$result = $urls - $nofollow - $internal_links;
Hope you can help, and if the idea is right maybe you can help me with the preg_match functions.
You can use PHP's DOMDocument class to parse the HTML and parse_url to parse the URLs:
$url = 'http://stackoverflow.com/';
$pUrl = parse_url($url);
// Load the HTML into a DOMDocument
$doc = new DOMDocument;
#$doc->loadHTMLFile($url);
// Look for all the 'a' elements
$links = $doc->getElementsByTagName('a');
$numLinks = 0;
foreach ($links as $link) {
// Exclude if not a link or has 'nofollow'
preg_match_all('/\S+/', strtolower($link->getAttribute('rel')), $rel);
if (!$link->hasAttribute('href') || in_array('nofollow', $rel[0])) {
continue;
}
// Exclude if internal link
$href = $link->getAttribute('href');
if (substr($href, 0, 2) === '//') {
// Deal with protocol relative URLs as found on Wikipedia
$href = $pUrl['scheme'] . ':' . $href;
}
$pHref = #parse_url($href);
if (!$pHref || !isset($pHref['host']) ||
strtolower($pHref['host']) === strtolower($pUrl['host'])
) {
continue;
}
// Increment counter otherwise
echo 'URL: ' . $link->getAttribute('href') . "\n";
$numLinks++;
}
echo "Count: $numLinks\n";
You can use SimpleHTMLDOM:
// Create DOM from URL or file
$html = file_get_html('http://www.site.com/');
// Find all links
foreach($html->find('a[href][rel!=nofollow]') as $element) {
echo $element->href . '<br>';
}
As I'm not sure that SimpleHTMLDOM supports a :not selector and [rel!=nofollow] might only return a tags with a rel attribute present (and not ones where it isn't present), you may have to:
foreach($html->find('a[href][!rel][rel!=nofollow]') as $element)
Note the added [!rel]. Or, do it manually instead of with a CSS attribute selector:
// Find all links
foreach($html->find('a[href]') as $element) {
if (strtolower($element->rel) != 'nofollow') {
echo $element->href . '<br>';
}
}
Just wondering if someone can help me further with the following. I want to parse the URL on this website:http://www.directorycritic.com/free-directory-list.html?pg=1&sort=pr
I have the following code:
<?PHP
$url = "http://www.directorycritic.com/free-directory-list.html?pg=1&sort=pr";
$input = #file_get_contents($url) or die("Could not access file: $url");
$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>";
if(preg_match_all("/$regexp/siU", $input, $matches)) {
// $matches[2] = array of link addresses
// $matches[3] = array of link text - including HTML code
}
?>
Which does nothing at present and what I need this to do is scrap all the URL in the table for all 16 pages and would really appreciate some help with how to amend the above to do that and output URL into a text file.
Use HTML Dom Parser
$html = file_get_html('http://www.example.com/');
// Find all links
$links = array();
foreach($html->find('a') as $element)
$links[] = $element->href;
Now links array contains all URLs of given page and you can use these URLs to parse further.
Parsing HTML with regular expressions is not a good idea. Here are some related posts:
Using regular expressions to parse HTML: why not?
RegEx match open tags except XHTML self-contained tags
EDIT:
Some Other HTML Parsing tools as described by Gordon in comments below:
phpQuery
Zend_Dom
QueryPath
FluentDom
You really shouldn’t use regular expressions to parse HTML as it’s to error prone.
Better use an HTML parser like the one of PHP’s DOM library:
$code = file_get_contents($url);
$doc = new DOMDocument();
$doc->loadHTML($code);
$links = array();
foreach ($doc->getElementsByTagName('a') as $element) {
if ($element->hasAttribute('href')) {
$links[] = $elements->getAttribute('href');
}
}
Note that this will collect the URI references as they appear in the document and not as an absolute URI. You might want to resolve them before.
It seems that PHP doesn’t provide an appropriate library (or I haven’t found it yet). But see RFC 3986 – Reference Resolution and my answer on Convert a relative URL to an absolute URL with Simple HTML DOM? for further details.
Try this method
function getinboundLinks($domain_name) {
ini_set('user_agent', 'NameOfAgent (<a class="linkclass" href="http://localhost">http://localhost</a>)');
$url = $domain_name;
$url_without_www=str_replace('http://','',$url);
$url_without_www=str_replace('www.','',$url_without_www);
$url_without_www= str_replace(strstr($url_without_www,'/'),'',$url_without_www);
$url_without_www=trim($url_without_www);
$input = #file_get_contents($url) or die('Could not access file: $url');
$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>";
//$inbound=0;
$outbound=0;
$nonfollow=0;
if(preg_match_all("/$regexp/siU", $input, $matches, PREG_SET_ORDER)) {
foreach($matches as $match) {
# $match[2] = link address
# $match[3] = link text
//echo $match[3].'<br>';
if(!empty($match[2]) && !empty($match[3])) {
if(strstr(strtolower($match[2]),'URL:') || strstr(strtolower($match[2]),'url:') ) {
$nonfollow +=1;
} else if (strstr(strtolower($match[2]),$url_without_www) || !strstr(strtolower($match[2]),'http://')) {
$inbound += 1;
echo '<br>inbound '. $match[2];
}
else if (!strstr(strtolower($match[2]),$url_without_www) && strstr(strtolower($match[2]),'http://')) {
echo '<br>outbound '. $match[2];
$outbound += 1;
}
}
}
}
$links['inbound']=$inbound;
$links['outbound']=$outbound;
$links['nonfollow']=$nonfollow;
return $links;
}
// ************************Usage********************************
$Domain='<a class="linkclass" href="http://zachbrowne.com">http://zachbrowne.com</a>';
$links=getinboundLinks($Domain);
echo '<br>Number of inbound Links '.$links['inbound'];
echo '<br>Number of outbound Links '.$links['outbound'];
echo '<br>Number of Nonfollow Links '.$links['nonfollow'];