de esa manera
Código PHP:
$productos = "=================== PRODUCTO 1 ===================\n " .
"Quantity: " . $_POST[qcant]. "\n" .
"Description: " . $_POST[qdescrip]. "\n" .
"Part Number: " . $_POST[qpart]. "\n" .
"Manufacturer: " . $_POST[qfab]. "\n";
for ($a=1 ;$a<=$_POST["item"];$a++){
$pqcant = "qcant".$a;
$pqdescrip = "qdescrip".$a;
$pqpart = "qpart".$a;
$pqfab = "qfab".$a;
$b = $a + 1;
$productos .= "=================== PRODUCTO ".$b." ===================\n " .
"Quantity: " . $_POST[$pqcant]. "\n" .
"Description: " . $_POST[$pqdescrip]. "\n" .
"Part Number: " . $_POST[$pqpart]. "\n" .
"Manufacturer: " . $_POST[$pqfab]. "\n";
}