剥离标签，但保留第一个

Question

How can I keep for example the first img tag but strip all the others?

(from a HTML string)

example:

<p>
 some text 
 <img src="aimage.jpg" alt="desc" width="320" height="200" /> 
 <img src="aimagethatneedstoberemoved.jpg" ... />
</p>

so it should be just:

<p>
 some text 
 <img src="aimage.jpg" alt="desc" width="320" height="200" /> 
</p>

Answer 1

You might be able to accomplish this with a complex regex string, however my suggestion would be to use preg_replace_callback, particularly if you are on php 5.3+ and here's why. http://www.php.net/manual/en/function.preg-replace-callback.php

$tagTracking = array();
preg_replace_callback('/<[^<]+?(>|/>)/', function($match) use($tagTracking) {
    // your code to track tags here, and apply as you desire.
});