PHP: Recursively show all data of arrays

gistfile1

<?php 
function show_data ($data) {
  foreach ($data as $key => $value) {
    echo '<ul style="margin-left: 20px">';
    if (gettype($value) == 'array' ) {
      echo '<li>' . $key . " : " . $value . '</li>';
      echo '<ul style="margin-left: 20px">';
      show_data($value);
      echo '</ul>';
    }
    else {
      echo '<li>' . $key . " : " . $value . '</li>';
    }
    echo '</ul>';
  }
}

?>