Passing values through variable does not work

Question

I’m using the MDL(google) framework to make a registration system, and in the part of changing the information in the database, in passing the values through the url, only some are passed and others are not. In addition, the name and surname of do not appear in the form, although the url received both. Here is the code: page showing the data(clients.php):

    $seleciona="select * from cadastro_clientes";
    $sql=mysqli_query($con,$seleciona);
        while ($reg=mysqli_fetch_assoc($sql)) {
        echo "
         <tr>
        <td class=mdl-data-table__cell--non-numeric>$reg[nome]</td>
        <td class=mdl-data-table__cell--non-numeric>$reg[endereco]</td>
        <td class=mdl-data-table__cell--non-numeric>$reg[numero]</td>
        <td class=mdl-data-table__cell--non-numeric>$reg[dada_comemorada]
        </td>
        <td class=mdl-data-table__cell--non-numeric>
        <a href=form_edit.php?ru="
        .urlencode($reg['nome']).
        "&en=".urldecode($reg['endereco']).
        "&nu=".urldecode($reg['numero']).
        "&da=".urldecode($reg['dada_comemorada']).
        ">Editar</a></td>
        </tr>";
                }

                ?>  

page that should show the data to change(form_edit.php):

       <?php
       include"conecta.inc";
       $recebenome=$_GET['ru'];
       $recebeendereco=$_GET['en'];
       $numero=$_GET['nu'];
       $data=$_GET['da'];
       ?>


     <div class="page-content">
            <form action="cadastrar.php" method="post" name="cadastro">
              <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
                <input class="mdl-textfield__input" type="text" id="sample3" name="nome" value=<?php echo $recebenome;?>>
                <label class="mdl-textfield__label" for="sample3">NOME</label>
              </div><br>
              <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
                <input class="mdl-textfield__input" type="text" id="sample3" name="endereco" value=<?php echo $recebeendereco;?>>
                <label class="mdl-textfield__label" for="sample3">ENDEREÇO</label>
              </div><br>
              <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
                <input class="mdl-textfield__input" type="text" id="sample3" name="numero" value=<?php echo $numero;?>>
                <label class="mdl-textfield__label" for="sample3">NUMERO</label>
              </div><br>
              <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
                <input class="mdl-textfield__input" type="text" id="sample3" name="data" value=<?php echo $data;?>>
                <label class="mdl-textfield__label" for="sample3">DATA COMEMORADA</label>
              </div><br>

                <input type="submit" value="SALVAR" class="mdl-button mdl-js-button mdl-button--raised mdl-js-ripple-effect mdl-button--accent">

            </form>

          </div>

in the url the name and surname passes, but does not appear in the form, and the number and date give the error "Notice: Undefined index: nu in C: xampp htdocs Bjorn form_edit.php on line 5", but if I register a client without space, all appear normally. I don’t know why this, since I used urlencode :/

note, when I click on the client that is unwritten without separating the words by space:

now when I click the registered client with spaces separating the name and surname, and the address (note that the url takes the name and surname, but not the full address:

Answer 1

The first provision is to put URLENCODE for all parameters.

<a href=form_edit.php?ru="
.urlencode($reg['nome']).
"&en=".urlencode($reg['endereco']).
"&nu=".urlencode($reg['numero']).
"&da=".urlencode($reg['dada_comemorada']).
">Editar</a>

And the second provision is on the page (form_edit.php):

The space will become an attribute separator and everything after the space will be seen as input element attribute.

The solution is to quote all values of inputs:

example value="<?php echo $recebenome;?>"

<input class="mdl-textfield__input" type="text" id="sample3" name="nome" value="<?php echo $recebenome;?>">

If you check the source code - without quotes in values - you will see that the inputs are with the data entered correctly, but in the page view only the first part appears and it is only this part that will be submitted to the page cadastrar.php.

<input type=text id=sample3 name=endereco value=Fulano de Tal>

<input type=text id=sample3 name=endereco value="Fulano de Tal">

Another example: imagine my name is Fulano style=color:red to correctly pass my name have to hug with quotes otherwise style=color:red will be interpreted as input element attribute.

<input type=text id=sample3 name=endereco value="Fulano style=color:red">

<input type=text id=sample3 name=endereco value=Fulano style=color:red>