codice:
$temp=array();
$temp['nome1']="ivano";
$temp['quantita1']="13";
$temp['nome2']="marco";
$temp['quantita2']="45";
$temp['nome3']="gianni";
$temp['quantita3']="32";
$temp2=array();
for ($i=1;$i<count($temp)/2+1;$i++)
	$temp2[$i]=$temp['nome'.$i].", ".$temp['quantita'.$i];
print_r($temp2);