There's got to be a better way:
if (isset($c['s']['a1'])) echo $c['s']['a1']."<br>";
if (isset($c['s']['a2'])) echo $c['s']['a2']."<br>";
if (isset($c['s']['a3'])) echo $c['s']['a3']."<br>";
if (isset($c['s']['a4'])) echo $c['s']['a4']."<br>";
if (isset($c['s']['a5'])) echo $c['s']['a5']."<br>";

but it's late and my brain is frazzled. Any ideas, oh PHP gurus?

--
"Checking identity papers is a complete waste of time. If anyone can
be counted on to have valid papers, it will be the terrorists".