Shell_Exec (): How to keep process active when restarting apache?

The processes run by php's shell_exec () end up restarting apache. Is it possible to keep processes running uninterrupted when restarting apache?

Below the code I'm using:

$Command = "ksh -c '(  trap \"\" 1 2 3 4 15; ";
$Command .= "./sc_serv /caminho-do-conf/sc_serv.conf";
$Command .= " > /dev/null )' & echo $!"." ;";

$ExecCommand = $Command;

echo "Comando Executado: " . $ExecCommand ;

$Result = shell_exec($ExecCommand);
echo "<pre>$Result</pre>";