Question

I’m trying to find all href links on a webpage and replace the link with my own proxy link.

For example

<a href="http://www.google.com">Google</a>

Needs to be

<a href="http://www.example.com/?loadpage=http://www.google.com">Google</a>

Answer 1

Use PHP’s DomDocument to parse the page

$doc = new DOMDocument();

// load the string into the DOM (this is your page's HTML), see below for more info
$doc->loadHTML('<a href="http://www.google.com">Google</a>');

//Loop through each <a> tag in the dom and change the href property
foreach($doc->getElementsByTagName('a') as $anchor) {
    $link = $anchor->getAttribute('href');
    $link = 'http://www.example.com/?loadpage='.urlencode($link);
    $anchor->setAttribute('href', $link);
}
echo $doc->saveHTML();

Check it out here: http://codepad.org/9enqx3Rv

If you don’t have the HTML as a string, you may use cUrl (docs) to grab the HTML, or you can use the loadHTMLFile method of DomDocument

Documentation

• DomDocument – http://php.net/manual/en/class.domdocument.php
• DomElement – http://www.php.net/manual/en/class.domelement.php
• DomElement::getAttribute – http://www.php.net/manual/en/domelement.getattribute.php
• DOMElement::setAttribute – http://www.php.net/manual/en/domelement.setattribute.php
• urlencode – http://php.net/manual/en/function.urlencode.php
• DomDocument::loadHTMLFile – http://www.php.net/manual/en/domdocument.loadhtmlfile.php
• cURL – http://php.net/manual/en/book.curl.php