Travers dynamically generated input array

Since no one answered my question in time, I'm going to contribute so that more people can be aids and not waste much time trying to solve a simple problem like that.

Follow the HTML Code:

<form id="boletin_cad" action="env_boletin.php" method="POST">
        <h2>BOLETIN DO ALUNO</h2><br />
        <aside id="inner_form">
            <select name="aluno[]" class="selec_aluno">
                <option value="">Selecione o aluno</option>
                <?php
                $pega_alunos = $db->prepare("SELECT * FROM efcol_cadastro WHERE status_conta = ? ORDER BY nome");
                $pega_alunos->execute(array('Ativo'));
                while ($dados_alunos = $pega_alunos->fetch()) {
                    echo '<option value="' . $dados_alunos['nome'] . '">' . $dados_alunos['nome'] . '</option>';
                }
                ?>            
            </select><br />
            <select name="prof[]" class="selec_aluno">

                <?php
                session_start();
                echo '<option value="' . $_SESSION['nome'] . '">' . $_SESSION['nome'] . '</option>';
                ?>            
            </select><br />
            <select name="materia[]" class="selec_materia">
                <option value="">Selecione a Matéria</option>
                <option value="01">LIBERTAÇÃO I</option>
                <option value="02">REGIÕES DE CATIVEIRO</option>
                <option value="03">H. ESPIRITUAL</option>
                <option value="04">ESQ. JEZABEL</option>
                <option value="05">ABORTO</option>
                <option value="06">ADULTÉRIO</option>
                <option value="07">DIVÓRCIO</option>
                <option value="08">LIB. SEXUAL I</option>
                <option value="09">LIB. SEXUAL II</option>
                <option value="10">INIMIGOS ESPIRITUAIS</option>
            </select><br />
            <legend>
                <span>Ano Letivo</span>
                <input type="text" name="ano[]" class="input_ano" />
            </legend>
            <legend>
                <span>Semestre</span>
                <select name="semestre[]" class="selec_semestre">
                    <option value="1">1º</option>
                    <option value="2">2º</option>
                </select></legend><br /><br />
            <legend>
                <span>Média</span>
                <input type="text" name="media[]" class="input_notas"/>
            </legend>
            <legend>
                <span>Faltas</span>
                <input type="text" name="faltas[]" class="input_faltas"/>
            </legend>            
        </aside>
        <div class="botoes">
            <button name="add_media">Cadastrar</button>
            <a href="javascript:void(0);" class="add_aluno">+ ADD ALUNO +</a>
            <a href="javascript:void(0);" class="ver_boletins">+ BOLETINS +</a>
            <div class="progress">
                <div class="bar"></div >
                <div class="percent">0%</div >
            </div>
            <div id="status"></div>
        </div>        
    </form>

The form above is dynamically generated so your input and select name are bracketed to retrieve as an array in php.

follows PHP:

include '../conecta.php';
$db = con::conectar();

$arr = array(
    'nome' => $_POST['aluno'],
    'professor' => $_POST['prof'],
    'materia' => $_POST['materia'],
    'ano' => $_POST['ano'],
    'semestre' => $_POST['semestre'],
    'media' => $_POST['media'],
    'faltas' => $_POST['faltas']
);

for ($i = 0; $i < count($arr['nome']); $i++) {
    $nameAluno = $arr['nome'][$i];
    $nameProf = $arr['professor'][$i];
    $nameMateria = $arr['materia'][$i];
    $anoLetivo = $arr['ano'][$i];
    $periodo = $arr['semestre'][$i];
    $valorMedia = $arr['media'][$i];
    $numFaltas = $arr['faltas'][$i];

    switch ($nameMateria) {
        case '01': $materiaNome = 'Libertação I - Padrão de aconselhamento na libertação';
            break;
        case '02': $materiaNome = 'Regiões de Cativeiro';
            break;
        case '03': $materiaNome = 'H. Espiritual';
            break;
        case '04': $materiaNome = 'Esq. Jezabel';
            break;
        case '05': $materiaNome = 'Aborto';
            break;
        case '06': $materiaNome = 'Adultério';
            break;
        case '07': $materiaNome = 'Divórcio';
            break;
        case '08': $materiaNome = 'Libertação Sexual I';
            break;
        case '09': $materiaNome = 'Libertação Sexual II';
            break;
        case '10': $materiaNome = 'Inimigos Espirituais';
            break;
    }

    switch ($periodo) {
        case '1': $periodoValue = '1º';
            break;
        case '2': $periodoValue = '2º';
            break;        
    }

    $includeBanco = $db->prepare("INSERT INTO media_alunos (aluno,professor,materia,ano,semestre,media,faltas) VALUES (?,?,?,?,?,?,?)");
    $includeBanco->execute(array($nameAluno, $nameProf, $materiaNome, $anoLetivo, $periodoValue, $valorMedia, $numFaltas));
}

echo '<pre>Cadastro efetuado com sucesso.</pre>';

All I had to do in PHP was to retrieve the variables of each input and select respectively and at the time of sorting the arrays I just had to do the count on the "for" with a key of the variables only and the rest I would pick up of the loop and the variable of increment, and ready solved, I was able to save in the pack each form separately with their respective data.