Replace href with a different value

Question

I have some PHP code which grabs a website's HTML code, then echos it to the screen. I'm looking for a way to scan the HTML, and then replace all href values with another value. For example, I have "http://somepage.com" which contains the HTML code
<a href="http://somepage.com/somepage">Click me</a>, however the value of the "href" part could change at any time. I want to echo the same HTML code, but replace the href value with http://mywebsite.com/somepage. How can I do that? I have this so far

$q = htmlentities($_GET['q']);

$html2 = "https://somewebsite.com/search/" . str_replace(' ', '%20', $q);

$html = file_get_contents($html2);

echo $html;

I've seen PHP DomDocument editing all links, however this returns an error for me

Warning: DOMDocument::loadHTMLFile(): I/O warning : failed to load external entity

I'm aware of `str_replace`, but since I don't necessarily know the href value, I need some way of finding out the href value and changing it — Hugh, Feb 04 '18 at 15:22
Possible duplicate of [PHP DomDocument editing all links](https://stackoverflow.com/questions/15469274/php-domdocument-editing-all-links) — iainn, Feb 04 '18 at 15:23
Try [Advanced HTML DOM](https://github.com/monkeysuffrage/advanced_html_dom). It will let you parse the HTML and search for and replace what ever you want. — ryantxr, Feb 04 '18 at 16:03

score 1 · Answer 1 · answered Feb 04 '18 at 15:53

You can use preg_replace() to replace the searched term in the string like this:

<?php
// example page contents
$pageContents = '<a href="http://somepage.com/somepage">Click me</a>Some example text.
<div>Example div <a href="http://anotherDomain.com/somepage2">Another link</a>.</div>';

//  ------ the Search pattern explanation -------
// (http:\/\/)? means that the http:// may or may not exist
// ([\w]+) the parentheses () will remember the expression inside
// the \s? means there may or may not be a space character there

//  ------ the Replace pattern explanation -------
// replace the matched expression with the provided replacement
// the $2 is the second parenthesized expression () from the search pattern
$html = preg_replace('/<a href="(http:\/\/)?[\w.]+\/([\w]+)"\s?>/', '<a href="http://mywebsite.com/$2">' ,$pageContents);

echo $html;
?>

which outputs:

Click meSome example text.

Example div Another link.

Replace href with a different value

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