<?php

protected $Conecta;
private $host = "localhost";
private $dbname = "classificados";
private $user = "root";
private $pass = "";

public function __construct() {

    try {

        $this->Conecta = new PDO("mysql:host={$this->host};dbname={$this->dbname}", "{$this->user}", "{$this->pass}");
        return $this->Conecta;
    } catch (PDOException $e) {

        echo $e->getMessage();
    }
}

<?php

private $verificaUser;

public function setUsuario($email, $senha) {
    $this->verificaUser = parent::prepare("SELECT email, senha FROM usuarios WHERE cl_email = :email AND senha = :senha");
    $this->verificaUser->bindValue(":email", $email);
    $this->verificaUser->bindValue(":senha", $senha);
    $this->verificaUser->execute();
    return $this->verificaUser->rowCount();
}

public function getUsuario() {
    return $this->setUsuario();
}

Fatal error: Uncaught Error: Call to undefined method Conexao::prepare() in /opt/lampp/htdocs/classificados/model/Sessao.class.php:10 Stack trace: #0 /opt/lampp/htdocs/classificados/model/Sessao.class.php(24): Sessao->setUsuario('fulano@bol.com', '123') #1 {main} thrown in /opt/lampp/htdocs/classificados/model/Sessao.class.php on line 10