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I have an application system step-by-step that would be step by step, ie first the user informs some data then others and others... I want to validate this data with PHP (because I have to query the database to see if the user already exists). I have the following code:
<form  method="post" action="forms/register.php">
    <div class="modal-content modal-person modal-person2">
        <div class="modal-header">
            <h4 class="modal-title md-title">Registrar</h4>
            <h5 class="modal-title md-title">login</h5>
        </div>
        <div class="modal-body">
            <?php
            if (isset($_REQUEST['error'])) {
                $erro = $_REQUEST['error'];
                if ($erro == "userexist") {
                    echo "<b class=\"text-danger\">Usuário ou email já cadastrado!</b>";
                    echo "<p class=\"text-danger\">Veja-os novamente..<br><br>";
                } else if ($erro == "passdistint") {
                    echo "<b class=\"text-danger\">Senhas são distintas!</b>";
                    echo "<p class=\"text-danger\">Os campos de senha devem ter a mesma senha..<br><br>";
                } else if ($erro == "every") {
                    echo "<b class=\"text-danger\">Erro desconhecido!</b>";
                    echo "<p class=\"text-danger\">Tente novamente mais tarde...<br><br>";
                } else if ($erro == "sucess") {
                    echo "<script>
                    $(function(){
                        if($('.ativo').next().size())
                        {
                            $('.ativo')
                                .hide(800)
                                .removeClass('ativo')
                                .next()
                                .show(800)
                                .addClass('ativo');
                        }
                     });</script>";
                }
            }
            ?>
            <div class="input-group md-input">
                <span class="input-group-addon pq-txt" id="basic-addon1">웃</span>
                <input type="text" class="form-control" maxlength="15" id="user" name="user" required="" placeholder="Usuário">
            </div>
            <div class="input-group md-input">
                <span class="input-group-addon pq-txt" id="basic-addon1">@</span>
                <input type="email" class="form-control" name="email" required="" placeholder="Email">
            </div>
            <div class="input-group md-input">
                <span class="input-group-addon md-txt" id="basic-addon1">#*</span>
                <input type="password" class="form-control" maxlength="15" id="senha" required="" name="pass1" placeholder="Senha">
                <span class="input-group-addon md-txt confirm" id="basic-addon1"><span class="confirm" >#*</span></span>
                <input type="password" class="form-control confirm" maxlength="15" id="senha2" required=""  name="pass2" placeholder="Confirmar Senha">
            </div>
            <input type="hidden" name="step" value="1">
            <div class="barprogress" >
                <div></div>
            </div><br>
        </div>
        <div class="modal-footer">
            <input type="submit" class="btn btn-success md-btn" value="Próximo"/>
            <div class="progress">
                <div class="progress-bar progress-bar-info" style="width: 33.3%">
                </div>
            </div>
        </div>
    </div>
    <div class="modal-content modal-person modal-person2">
        <div class="modal-header">
            <h4 class="modal-title md-title">Registrar</h4>
            <h5 class="modal-title md-title">perfil</h5>
        </div>
        <?php
            if (isset($_REQUEST['error'])) {
                $erro = $_REQUEST['error'];
                if ($erro == "userexist") {
                    echo "<b class=\"text-danger\">Usuário ou email já cadastrado!</b>";
                    echo "<p class=\"text-danger\">Veja-os novamente..<br><br>";
                } else if ($erro == "passdistint") {
                    echo "<b class=\"text-danger\">Senhas são distintas!</b>";
                    echo "<p class=\"text-danger\">Os campos de senha devem ter a mesma senha..<br><br>";
                } else if ($erro == "every") {
                    echo "<b class=\"text-danger\">Erro desconhecido!</b>";
                    echo "<p class=\"text-danger\">Tente novamente mais tarde...<br><br>";
                } else if ($erro == "sucess2") {
                    echo "<script>
                    $(function(){
                        if($('.ativo').next().size())
                        {
                            $('.ativo')
                                .hide(800)
                                .removeClass('ativo')
                                .next()
                                .show(800)
                                .addClass('ativo');
                        }
                     });</script>";
                }
            }
            ?>
        <div class="modal-body">
            <center><img src="..." alt="..." width="100" height="100" class="img-circle perfil"></center><br>
            <div class="input-group pq-input">
                <span class="input-group-addon pq-txt" id="basic-addon1">웃</span>
                <input type="file" class="form-control btn btn-default md-btn fileimg" accept="image/*"  name="img" required="" >
            </div>
            <div class="input-group md-input">
                <span class="input-group-addon md-txt" id="basic-addon1">Nome</span>
                <input type="text" class="form-control" maxlength="200" required="" name="nome" placeholder="Nome Completo">
            </div>
            <div class="input-group md-input">
                <span class="input-group-addon md-txt" id="basic-addon1">Nascimento</span>
                <input type="date" class="form-control" required="" name="data">
                <span class="input-group-addon md-txt" id="basic-addon1">Profissão</span>
                <input type="text" class="form-control" maxlength="100" required=""  name="profissao" placeholder="Trabalho em..">
            </div>
            <input type="hidden" name="step" value="2">
        </div>
        <div class="modal-footer">
            <input type="submit" class="btn btn-success md-btn" value="Próximo"/>
            <div class="progress">
                <div class="progress-bar progress-bar-info" style="width: 66.6%">
                </div>
            </div>
        </div>
    </div>
</form>
The first part (where the user informs login, email and password) is confirmed thus:
$mnpdo = new MinPDO();
$step = $_REQUEST['step'];
if($step == 1) {
    if(isset($_REQUEST['user']) and isset($_REQUEST['email'])) {
        $user = $_REQUEST['user'];
        $email = $_REQUEST['email'];
        try {
            $result = $mnpdo->consult("users", "*", "email = '$email' or username = '$user'");
            if($result[0]["username"] == $user or $result[0]["email"] == $email) {
                header("location:../singup.php?error=userexist");
                exit();
            }    
        } catch (MinPDOException $ex) {
            if($ex->getMessage() != "No results!") {
                header("location:../singup.php?error=".$ex->getMessage());
                exit();
            }
        }
        if(isset($_REQUEST['pass1'])) {
            $pass1 = $_REQUEST['pass1'];
            if(isset($_REQUEST['pass2'])) {
                $pass2 = $_REQUEST['pass2'];
                if($pass1 != $pass2) {
                    header("location:../singup.php?error=passdistint");
                    exit();
                } else {
                    header("location:../singup.php?error=sucess");
                    exit();
                }
            } else {
                header("location:../singup.php?error=pass2");
                exit();
            }
        } else {
            header("location:../singup.php?error=pass");
            exit();
        }
    } else {
        header("location:../singup.php?error=user");
        exit();
    }
}
When it validates return sucess and so I do the action to go to the next step.. 
How do I stop when he comes back with the sucess or even failed it does not lose the data that has been validated? 
I was thinking as I validate go storing the values in an array $validado['meuinput'] and when returning with head take the array values, but how do I pass the array to the page? (not by url - get)
I think you can use session variables.
– gustavox