asked on

remove all external links from string

i have a string:

$data = '<p>Click here to <a href="http://www.mysite.com/contact.html" title="Contact us">contact us</a> or <a href="about.html" title="About us">read more about us</a> or click here to <a href="mailto:info@mysite.com" title="Email us">email us</a> or visit my friends site at <a href="http://www.anothersite.com" title="Friends site">http://www.anothersite.com</a> to speak to contact him.</p>';

Basically what i would like is to do is remove the <a></a> tags from all external links. So my string would look like this:

$data = '<p>Click here to <a href="http://www.mysite.com/contact.html" title="Contact us">contact us</a> or <a href="about.html" title="About us">read more about us</a> or click here to <a href="mailto:info@mysite.com" title="Email us">email us</a> or visit my friends site at http://www.anothersite.com to speak to contact him.</p>';

Please advise with example snippets.

orbic1

function filter($badwords){

$swapbad = array(",",":",";","%","http","[url=","[/url]","//","\\","</a>","<a href");
$nobadwords = " ** ";
      foreach($swapbad as $replace){
            $badwords = str_replace($swapbad,$nobadwords,$badwords);
      }
      return $badwords;
}

just call it like filter($data);

This checks all stuff found in $data against the array and swaps it for **

ellandrd

ASKER

that removes all links. i only want to remove external links.

i found this previous question where the asker wanted to remove internal links but i cant make it work for only external, keeping internal links

https://www.experts-exchange.com/questions/21985319/Remove-Internal-Hyperlinks.html

Maybe you can??

orbic1

$external = 'http://';
$pos = strpos($mystring, $findme);

// Note use of ===. Simply == would not work as expected

if ($pos === true) {
// PUT filter in here
} else {
// Don't do anything because http:// was not found in $data
}

orbic1

then just change your "badwords" array as appropriate

ASKER CERTIFIED SOLUTION

Richard Quadling

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Richard Quadling

My reasoning here is that ALL external links will start with http://. But you may also have local links starting with http:// AND you may also have subdomains, so the domain has to end in "mysite.com".

Richard Quadling

Thanks.