Question

I have a bunch of text with html in it. Basically what I want to do is for all links found in this text I want to add a rel=”noindex” to every link found only if the title attribute is no present.

For example if a link looks like this:

<a href="test.html">test</a>

I want it to look like:

<a rel="nofollow" href="test.html">test</a>

But if the link looks like this:

<a title="test title" href="test.html">test</a>

I dont want to add the rel=”nofollow” attribute to that. How can I do that in php?

EDIT:

Im sorry I didnt mention this but I am using PHP4. Yes I know but Im stuck with PHP4.

Answer 1

First use preg match to get if title is added.

$str = '<a href="test.html">test</a>';
if(!preg_match('/title=/', $str))
{
    $str = str_replace('href=', 'rel="nofollow" href=', $str);
}