thx for the help its working after some modification... one more question i have tablle to show the info but the title show alle time if i have ther any fiels or not. how can i hide this?? the title have to show only if one of the fields have value ... This part
$grid_details .= "<h2>Nährwerte & Allergene</h2>
<table class="ewtable">
<tbody>
<tr>
<td width="70%">
Nährwerte
</td>
<td width="20%">
pro 100g
</td>
</tr>';
$P_Energie = get_post_meta(get_the_ID(), "P_Energie", true);
if(!empty($P_Energie)){
$grid_details .= "
<tr>
<td>Energie</td >
<td>".$P_Energie."</td>
</tr>
";
}
$P_Fett = get_post_meta(get_the_ID(), 'P_Fett', true);
if(!empty($P_Fett)){
$grid_details .= "
<tr>
<td>Fett</td>
<td>". $P_Fett . "</td>
</tr>";
}