Object Orientation in PHP, crud example with ajax

Question

I’m trying to learn Object-Oriented PHP, but I’m having a hard time finding an example. Someone can show a simple example of the crud case below:

• A php class, for example user, in this class has methods that return the user by id.

• return all users.

• inserts the user.

• updates the user.

• deletes the user.

I was also wondering what to call these methods.

In case I will use ajax then I will have to use a php file instantiated the class object.

I apologise for the naiveté, but I believe that here I will have the best examples and support in the doubts.

If anyone knows/has any material relevant to this also thank you.

What I did:

  <?php
    class Listas{
      public $guid;
      public $eguid;
      public $concluida;
      public $titulo;
      public $descricao;
      public $datecreate;

      function listarListas($db){
        $result = $db->select('cad_listaconf');
        $res = array();
        $res = $db->getResult();

        return $res;
      }

      function inserirLista($eguid, $titulo, $descricao, $datecreate, $db){
        if ($query = $db->insert('cad_listaconf', array('eguid'=>$eguid,         'titulo'=>$titulo, 'descricao'=>$descricao, 'datacreate'=>$datecreate))){
          return 1;
        } else {
          return 0;
        }
      }

    }

?>