Get list of permissions in Drupal

dumppermissions.php

$permissions = test_invoke_all('permission');
foreach ($permissions as $key => $value) {
    $title = $value["title"];
    $description = "";
    $module = $value["module"];
    if (isset($value["description"])) {
      $description = $value["description"];
    }
    echo "$module&$key&$title&$description \n";
} 

function test_invoke_all($hook) {
  $args = func_get_args();
  // Remove $hook from the arguments.
  unset($args[0]);
  $return = array();
  foreach (module_implements($hook) as $module) {
    $function = $module . '_' . $hook;
    if (function_exists($function)) {
      $result = call_user_func_array($function, $args);
      if (isset($result) && is_array($result)) {
        $temp = array();
        foreach($result as $key => $value) {
          $value["module"] = $module;
          $temp[$key] = $value;
        }
        $return = array_merge_recursive($return, $temp);
      }
      elseif (isset($result)) {
        $result["module"] = $module;
        $return[] = $result;
      }
    }
  }
  return $return;
}