Using new Class() or instead of new Namespace Class() in PHP autoload

Question

I’m facing a problem to handle my classes with the composer autoload.

All calls are made through Jquery, then it calls a PHP document that should assemble the class page and call the function I need.

Example:

I have a login page, when I fill in all fields it will make the call through the file that is in JS.

Example of button:

<button type="button" class="btn btn-primary" name="btn-login" id="btn-login" onclick="JavaScript:getClasseLogin().fazerLogin()">
    Entrar
</button>

When he makes the call from getClasseLogin().fazerLogin(), everything is working perfectly, it can call the URL normally, follows code:

fazerLogin: function () {
        $("#btn-login").click(function () {
            var data = $("#login-form").serialize();

            $.ajax({
                type : 'POST',
                url  : 'classes/retorna_metodo_ajax.php?classe=Cliente&metodo=validaUsuario',
                data : data,
                dataType: 'json',
                beforeSend: function()
                {
                    $("#btn-login").html('Validando ...');
                },
                success :  function(response){
                    if(response.codigo == "1"){
                        console.log("entra no if");
                        $("#btn-login").html('Entrar');
                        $("#login-alert").css('display', 'none')
                        window.location.href = "home.php";
                    }
                    else{
                        console.log("entra no else");
                        $("#btn-login").html('Entrar');
                        $("#login-alert").css('display', 'block')
                        $("#mensagem").html('<strong>Erro! </strong>' + response.mensagem);
                    }
                }
            });
        })
    }

The whole problem starts now...

The URL he is sending is as follows:

https://jkads.com.br/bootstrap/classes/retorna_metodo_ajax.php?classe=Clientes&metodo=validaUsuario

In there he passes to the document retornar_metodo_ajax.php, that is this way:

<?php
require_once "../vendor/autoload.php";
ob_start();
//$params = $_GET['params'];
$classe = $_GET['classe'];
$metodo = $_GET['metodo'];
var_dump($classe);
var_dump($metodo);
if($classe == null || $metodo == null) {
    die("Não possui classe ou método");
} else {
    $_nome = htmlentities(strip_tags($_GET["classe"]), ENT_COMPAT, "UTF-8");
    if (!file_exists($classe . ".php")) {
        die("Classe não encontrada.");
    }
    $_class = new $classe();
    echo $_class->$metodo();
}

It enters the document, can do the proper checks, but when it tries to insert the class it returns the error:

Fatal error: Class 'Customers' not found in /home/jkadsco1/Domains/jkads.com.br/public_html/bootstrap/classes/retorna_metodo_ajax.php on line 18

The document Clientes.php is this:

<?php

namespace Clientes;

class Clientes {

    function __construct()
    {
        return '';
    }

    public function validaUsuario($params)
    {
        echo "<script>alert('Chegou aqui também')</script>";
        $parametros = explode(",", json_decode($params));
        echo "<script>alert(".$parametros.")</script>";
        return 1;
    }
}

He can not call the class, because unfortunately, every time I will make use of a class in a document, I need to use as below:

$cliente = new \Clientes\Clientes();
$cliente->validaUsuario();

When the document retorna_metodo_ajax.php tries to do the new() he is not succeeding as he cannot find without specifying how new \Namespace\Classe().

Is there any way to make every time I call the new Class() it just calls for the specified class instead of new \Namespace\Class()?

I’ve tried to give a include() with the class document, but it does not work. Try to concatenate as $_class = new "\\".$classe."\\".$classe() didn’t work either.

Can someone shed some light on that?

---

Folder structure:

.
├── classes
│   ├── BaseBD.php
│   ├── BdMySql.php
│   ├── Cadastro.php
│   ├── classNoticias.php
│   ├── Clientes.php
│   ├── conec.php
│   ├── ConecxaoBd.php
│   ├── conexao.php
│   ├── Datas.php
│   ├── funcoesGerais.php
│   ├── Globals.php
│   ├── GravarLogs.php
│   ├── Menus.php
│   ├── News.php
│   ├── Noticias.php
│   └── retorna_metodo_ajax.php
│
├── composer.json
├── composer.lock
├── index.php
└── vendor
    └── autoload.php

Composer.json

{
    "autoload": {
        "classmap": [
            "classes"
        ]
    }
}