How to remove the file extension through in the list through the line?

Question

PHP

Hello everyone, guys, tell me how to remove the file extension in the list if the extension is through the line
KX5-1
28346.mp4
KX5-2
28347.mp4
KX5-3
28348.mp4
as an example ,
I need to remove .mp4 tried various ways and regular expressions and it doesn’t work, the list is spoiled
list like this

foreach($matches as $vals)
      {
        for ($i=0; $i<count($vals); $i++)
        echo "<li><i>$vals[$i]</i></li>";
      }

Answer 1

You create the second empty array and copy the data element by element from the first array. If the string has an extension (check pregmatch) - cut off the extension with the usual substr and put it in the second array