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$valores = Array(); 

$valores[] = $valor; 

echo implode($valores, ","); 

<?php
$tamanho = "Tamanho";
$valores = Array("P", "M", "G");
echo "$tamanho ";
echo implode($valores, ",");
?>

                            foreach($variables as $variable)
                            {
                                echo '
                                    <tr>
                                        <td>'. $variable->id .'</td>
                                        <td>'. $variable->name .'</td>
                                        <td>'. $variable->values .'</td>
                                     </tr>
                                ';
                            }

<tr>
<td>Tamanho</td>
<td>P</td>
</tr>
<tr>
<td>Tamanho</td>
<td>M</td>
</tr>
<tr>
<td>Tamanho</td>
<td>G</td>
</tr>

<tr>
<td>Tamanho</td>
<td>P,M,G</td>
</tr>

// CRIANDO OS ARRAYS
$tamanho = Array();
$nomes = Array();

// SEU FOREACH ARMAZENANDO OS VALORES
foreach($variables as $variable) {

$tamanho[] = $variable->id;
$nomes[] = $variable->name;

}

// FORA DO FOREACH
$imp = implode($nomes, ",");

// EXIBINDO A LINHA

echo "<tr>
<td>{$tamanho[0]}</td>
<td>{$imp}</td>
</tr>";

$tamanho = Array();
$valor_tamanho = Array(); 

if($variable->id=="Tamanho") {
$tamanho[] = $variable->id;
$valor_tamanho[] = $variable->name;
} 

$imp1 = implode($valor_tamanho, ",");
echo "<tr>
<td>{$tamanho[0]}</td>
<td>{$imp1}</td>
</tr>"; 

$cor = Array();
$valor_cor = Array(); 

if($variable->id=="Cor") {
$cor[] = $variable->id;
$valor_cor[] = $variable->name;
} 

$imp2 = implode($valor_cor, ",");
echo "<tr>
<td>{$cor[0]}</td>
<td>{$imp2}</td>
</tr>"; 

 foreach($variables as $variable)
                            {
                                $values[] = $variable->values;
                                $imp = implode($values, ",");
                                
                                echo '
                                    <tr>
                                        <td>'. $variable->name .'</td>
                                        <td>'. $imp .'</td>
                                     </tr>
                                ';
                            }
 

//cria 2 tabelas, uma para dados e outra para valores
CREATE TABLE variables (id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY(id), name VARCHAR(45))
CREATE TABLE variables_values (idVariable INT, value VARCHAR(45))

//insere dados nas duas tabelas
INSERT INTO variables (name) VALUES ('$nome')

//recuperar ultimo id inserido na tabela VARIABLES
INSERT INTO variables_values (idVariables, value) VALUES (LAST_INSERT_ID(), '$value') 

//seleciona dados das 2 tabelas
SELECT *
FROM variables
INNER JOIN variables_values
ON variables.id=variables_values.idVariables; 

<tr>
   <td>Dado</td>
   <td>Valor 1, Valor 2, Valor 3</td>
</tr>