Ok I figured it out!
// Get Mar Prices.
$marp1 = "120250";
$marp2 = "90670";
$marp3 = "500";
$marp4 = "2";
$marprice1 = bcmul($mar, $marp1);
$marprice2 = bcmul($mar, $marp2);
$marprice3 = bcmul($mar, $marp3);
$marprice4 = bcmul($mar, $marp4);
$maurprice1 = bcmul(445620, $maur);
$maurprice2 = bcmul(180645, $maur);
$maurprice3 = bcmul(1000, $maur);
$maurprice4 = bcmul(4, $maur);
$irtprice1 = bcmul(25160, $irt);
$irtprice2 = bcmul(13690, $irt);
$irtprice3 = bcmul(120, $irt);
$irtprice4 = bcmul(1, $irt);
$ptprice1 = bcmul(25160, $pt);
$ptprice2 = bcmul(13690, $pt);
$ptprice3 = bcmul(120, $pt);
$ptprice4 = bcmul(1, $pt);
$espprice1 = bcmul(162324, $esp);
$espprice2 = bcmul(67670, $esp);
$espprice3 = bcmul(300, $esp);
$espprice4 = bcmul(6, $esp);
$stprice1 = bcmul(25160, $st);
$stprice2 = bcmul(13690, $st);
$stprice3 = bcmul(150, $st);
$stprice4 = bcmul(1, $st);
$ftprice1 = bcmul(55190, $ft);
$ftprice2 = bcmul(26050, $ft);
$ftprice3 = bcmul(300, $ft);
$ftprice4 = bcmul(2, $ft);
$rprice1 = bcmul(6550, $r);
$rprice2 = bcmul(4670, $r);
$rprice3 = bcmul(50, $r);
$rprice4 = bcmul(2, $r);
$bprice1 = bcmul(20250, $b);
$bprice2 = bcmul(19670, $b);
$bprice3 = bcmul(38, $b);
$bprice4 = bcmul(8, $b);
Evidently bcmul(); is what php5 is using to multiply parameters.
Thank you,
greenbman