HTML string append/replace in PHP - php

Question

I have the following html string in my php code:
<iframe src="https://player.vimeo.com/video/123456789" width="604" height="340" frameborder="0" title="Ovarian Psycos - Teaser" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe>
I want to append parameters to the URL give in the src attribute. The result should look as follows:
<iframe src="https://player.vimeo.com/video/123456789/APPENDAGE" width="604" height="340" frameborder="0" title="Ovarian Psycos - Teaser" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe>
As you can see, in my example the string /APPENDAGE should be appended to the URL givein in the src attribute.
Usually I would do something like this with a string-replace method, however, in the given case this approach won't work. What would be an efficient approach to reach my goal?

Answer 1

If you don't mind using regex, there is a simple solution for this: (DEMO)
$str = '<iframe src="https://player.vimeo.com/video/123456789" width="604" height="340" frameborder="0" title="Ovarian Psycos - Teaser" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe>
';
$replaced = preg_replace('/(?<=src=")(.*?)(?=")/', '$1/APPENDAGE', $str);
var_dump($replaced);
Output:
string '<iframe src="https://player.vimeo.com/video/123456789/APPENDAGE" width="604" height="340" frameborder="0" title="Ovarian Psycos - Teaser" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe>
' (length=215)
This will simply match the url, insdie src attr and append /APPENDAGE to it, you can change it to whatever you want.

Answer 2

if you don't mind a large code
<?php
$str = '<iframe src="https://player.vimeo.com/video/123456789" width="604" height="340" frameborder="0" title="Ovarian Psycos - Teaser" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe>';
$obj = simplexml_load_string($str);
//print_r($obj);
$obj['src'] = $obj['src'].'/APPENDAGE';
$s = $obj->asXML();
print(substr( $s, strpos($s, "\n")+1 ));
But this code will also work for rest of the attributes