APO-Epsilon/apo-website

<?php
if(isset($_SESSION['sessionID'])){
  if($_SESSION['sessionexec'] == 1){
    $exec_authorized = False;
    if($exec_page){
      include('mysql_access.php');
      if (!isset($permissions_page)) {
        $permissions_page = $_SERVER['PHP_SELF'];
      }
      $sql = "SELECT * FROM exec_permissions WHERE position = \"{$_SESSION['sessionposition']}\" AND page = \"$permissions_page\";";
      $result = $db->query($sql);
      if(mysqli_num_rows($result) != 0){
        $exec_authorized = True;
      }
    }
    if($exec_authorized){
      show_exec();
    } elseif($active_page){
      show_active();
    } elseif($public_page){
      show_public();
    } elseif($exec_page){
      show_insuff_permissions();
    } else{
      show_error();
    }
  } else{
    if($active_page){
      show_active();
    } elseif($public_page){
      show_public();
    } elseif($exec_page){
      show_insuff_permissions();
    } else{
      show_error();
    }
  }
} else{
  if($public_page){
    show_public();
  } elseif($exec_page || $active_page){
    show_login();
  } else{
    show_error();
  }
}

function show_error() {
  echo "<div class=\"small-12 columns\">";
  echo "<h2>Oops</h2>";
  echo "<p>There's been an error. This page doesn't have any content.</p>";
  echo "</div>";
}

function show_insuff_permissions() {
  echo "<div class=\"small-12 columns\">";
  echo "<h2>Sorry</h2>";
  echo "<p>Only certain members of exec can view this page.</p>";
  echo "</div>";
}

function show_login() {
  require_once('login_form.php');
}

?>