$buff .= " <tr><td align='center'><a href= 'http://x/xx/xxx/print_.php?invoice_num=" . $string2 . "&otravar=algo&otraotravar=otracosa&otraa=mas'target='_blank'>".$valor2." </a> <b></td><td>$array_inv[$indice2]</td></b></tr>";