gpg: cannot open /dev/tty

[Graziano]

Hello

I written a php script to delete secret keys , however I receive this error ;
 >gpg: cannot open /dev/tty

If I add --no-tty I receive this error ,
 >gpg: Sorry, no terminal at all requested - can't get input

Any idea ?

Below there is the php script (the command executed is on $command) .
Thank you
Graziano Meneguzzo
Rome ,Italy

<?
function getDELETEPRIVATE()
{
     ob_start();
$command = "/usr/bin/gpg --no-secmem-warning --home /home/test/.gnupg --yes 
--yes --delete-secret-key 'B209E218'";

	passthru($command);
	
          echo"<pre>";
         $lookup = ob_get_contents();
     ob_end_clean();
     return $lookup;
}

$delete = getDELETEPRIVATE();
echo  "=========================================</BR>";
echo  "<pre>$delete</pre>";
?>