in PHP, how to remove specific class from html tag?

Question

given the following string in PHP:

$html = \"

text 1


        
      

Answer 1

using the PHP Simple HTML DOM Parser

Updated and tested! You can get the simple_html_dom.php include from the above link or here.

for both cases:

include('../simple_html_dom.php');

$html = str_get_html("
text 1
text 2
text 3
text 4
");

case 1:

foreach($html->find('span[class*="test2"]') as $e)
$e->class = '';

echo $html;

case 2:

foreach($html->find('span[class*="test2"]') as $e)
$e->parent()->innertext = $e->plaintext;

echo $html;