Return data from a class to index

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Return data from a class to index

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#1 by (1 votes)

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I'm implementing PHP Object Oriented and I'm developing a CRUD of students.

I have a class to count the number of students in the bank. And I wanted to get the return of the function that counts the students and send that result to index, but I'm having a hard time doing that.

class ShowAlumnus.php:

<?php

class MostraAluno
{
    protected $nome, $media;
    public $dns = 'mysql:host=localhost;dbname=alunos';
    public $user = 'root';
    public $pass = 'vertrigo';
    public $pdo;

    public function __construct()
    {
        try {
            $this->pdo = new PDO($this->dns, $this->user, $this->pass);
        } catch (PDOException $e) {
            die('Erro de conexao com o banco de dados: ' . $e->getMessage());
        }
    }

    public function contaAluno()
    {
        $count = "SELECT COUNT(*) AS total FROM usuarios ORDER BY nome ASC";

        $stmt_count = $this->pdo->prepare($count);
        $stmt_count->execute();
        $total = $stmt_count->fetchColumn();

        return $total;
    }
}

And the index.php:

<?php

require_once 'core/MostraAluno.php';

$mostraAluno = new MostraAluno();

$alunos = $mostraAluno->mostraAluno();
$totAlunos = $mostraAluno->contaAluno();

?>
<!DOCTYPE html>
<html>
<head>

<link rel="stylesheet" type="text/css" href="static/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="static/css/style.css">

<meta charset="utf-8">
<title>Notas - Alunos</title>
</head>
<body>

<!--
=======================================================================
                                NAVBAR
=======================================================================
-->
<nav class="navbar navbar-inverse">
<div id="inicio" class="container-fluid">

  <div class="navbar-header">
    <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
      <span class="sr-only">Toggle navigation</span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
    </button>
    <a class="navbar-brand" href="#inicio"><b>Sistema de notas</b></a>
  </div>

  <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
    <ul class="nav navbar-nav">
        <li><a href="cadastrar.php"><u>Cadastrar novo aluno</u></a></li>
      </ul>
    <ul class="nav navbar-nav navbar-right">
      <li class="dropdown">
        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Perfil <span class="caret"></span></a>
        <ul class="dropdown-menu">
          <li role="separator" class="divider"></li>
          <li><a href="core/logout.php">Sair</a></li>
        </ul>
      </li>
    </ul>
  </div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>

<!--
=======================================================================
                                CORPO
=======================================================================
-->

<div class="row">
    <div class="col-xs-12 col-sm-12 col-md-12 col-lg-12" style="background-color: ">
  <center><h4 class="bg-info"><b>Total de alunos: <?php echo $totAlunos; ?></b></h4></center>
    </div>
</div>

When you run the index, only the text 'Total students:' appears and there is no return of the method.

In the file MostraAluno I have removed the method mostraAluno() , because my question is only with the contaAluno() method.

Could someone tell me where I'm going wrong? I am now starting to implement PHP OO and am having trouble returning the method values to other files.

php

asked by anonymous 18.05.2017 / 16:57

1 answer

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score 1 · Answer 1

Although you have already encountered the error. There's another way to do it if you wanted to use one day:

    $stmt_count = $this->pdo->prepare($count);
    $stmt_count->execute();
    $total = $stmt_count-> rowCount(); // aqui ele conta o total

The good thing about this is that you can select all students (in this case) and only use rowCount(); to count the total amount, without having to make two connections.