Dynamic pages through request

I am putting together a web application in a way that future maintenance is simplified.

So, I started searching for dynamic pages, etc. But in practice, I do not even know how to start.

I wanted it to look like this:

• header.php: header with side menu linking to other pages

• content.php: (already done)

• footer.php: (I've already done it)

In my index.php, I call the css, js, etc. files. And I give an include in header, content, footer ...

Folders:

Up to that point ...

In my header, in the menu, there are several links, but I did not want to have to create 15, 20 different pages. But yes, 1 page with the content for each link.

How do I do this?

I was wondering how I could do this, along with the database, in testing this almost everything going well, but it is not displaying my content.

Here's how I did it:

I created a table (tblPaginas), in it put the fields: id, name, controller, arg and ennable.

id name     controller arg  ennable
1  index                0     0

2  pagina1     pag      1     1

3  pagina2     pag      2     1

4  pagina3     pag      3     1

etc

In my header, I put the following:

<?php       
    echo '
        <li>
                    <a href="javascript:;">
                    <i class="icon-basket"></i>
                    <span class="title">PAGINAS</span>
                    <span class="arrow "></span>
            </a>';

    echo ' <ul class="sub-menu">';

                $sql= ("SELECT * FROM tblPaginas where ennable = 1 and arg > '0' order by id ");
                $query = mysql_query($sql);
                while($row = mysql_fetch_array($query))
                {

                echo'                         
                    <li>
                            <a href="index.php?'.$row['controller'].'='.$row['arg'].'">
                            <text style="TEXT-TRANSFORM: uppercase;">'.$row['name'].' </text></a>
                    </li>' ;}

                    echo '</ul>';
                    echo '</li>';
?>

So, it displays my side menu, taking the 'name' (page name in the menu), and sending the controller and arg through the URL.

On my content.php page, I tried the following:

<?php
$uri = $_GET['arg'];

    $var = $uri;
    switch ($var)
{
    case 1:
    include 'pag/geral.php';
    break;

    case 2:
    include 'pag/pagina2.php';
    break;

    case 3:
    echo "DEU CERTO O 3";
    break;
}

?>

But he is not displaying the pages, this code is not working this content page.

I thought of doing so, as I can later try to make a control panel, and edit the pages by the bank.

Can you help me make this code work?