PHP shell_exec() output in html not the same format as Linux terminal output

Issue

When I run the code below I get the output on new lines however the spacing is wrong.

Example code:

  <?php
    $data = shell_exec("df -h");
    echo nl2br($data);
  ?>

Webpage output:

I used nl2br() to get the command on new lines which is close to what i want but how do i get the spacing to match the terminal spacing?

Terminal output:

Solution

I found the answer:

<?php
  $data = shell_exec("df -h");
  echo "<pre>$data</pre>";
?>

Gives me this output in the web:

Answered By - confused