Extract links from a external webpage

[jacksont123]

How do I extract links from an external webpage and display them with php?

Example:
I would have php extract all the links from: http://www.php-mysql-tutorial.com/
and display the links in the php file.

[mburt]

Sorry, but as far as I know of, you can't extract/open anything from an external webpage.
This would be the logical way to do it:

$page = file("http://www.php-mysql-tutorial.com/");
foreach ($page as $num => $lines) {
    $links = strpos($lines,"<a");
    $linksend = strpos($lines,"</a>");
    echo substr($lines,$links,$linksend+3);
    } 

But you can't get contents from external pages... I'll keep looking, but I don't think it's possible.

[jacksont123]

Sorry, but as far as I know of, you can't extract/open anything from an external webpage.
This would be the logical way to do it:

$page = file("http://www.php-mysql-tutorial.com/");
foreach ($page as $num => $lines) {
    $links = strpos($lines,"<a");
    $linksend = strpos($lines,"</a>");
    echo substr($lines,$links,$linksend+3);
    } 

But you can't get contents from external pages... I'll keep looking, but I don't think it's possible.

Thats exactly what I wanted. Thanks.
Is it possible to make one that only extracts certain links in a folder.
ie: one that would extract all links in the folder "jump"

[mburt]

Sure. Edit the search query:

$links = strpos($lines,"<a href=\"subfolder here\\"); 

[Twey]

For a more robust solution, the PHP5 DOM module is capable of parsing HTML. You can then use getElementsByTagName() to find all the links in a document.

If you have PHP4, you'll need to use php-html. Then,

<?php
  include('htmlparser.inc');

  $urls = array();
  HtmlParser remotePage = new HtmlParser(file_get_contents('http://www.example.com/some/page.html'));

  while($remotePage->parse())
    if($remotePage->iNodeType == NODE_TYPE_ELEMENT && strtolower($remotePage->iNodeName) == "a" && isset($remotePage->iNodeAttributes['href']))
      array_push($urls, $remotePage->iNodeAttributes['href']);
?>

You'll then have a nice list of URLs in $urls.

But you can't get contents from external pages...

You will, however, need to have allow_url_fopen enabled in your php.ini.

/EDIT: XML_HTMLSax is also an option. Probably a better one, since it's been accepted into PEAR.

[mburt]

Wow... there's alot of PHP functions there that are DOM related

[jacksont123]

whoops. wrong topic. sorry