PHP mortgage calculation

function debx() { $dkm = 360; //贷款月数，20年就是240个月 $dkTotal = 390000; //贷款总额 $dknl = 0.049; //贷款年利率 $emTotal = $dkTotal * $dknl / 12 * pow(1 + $dknl / 12, $dkm) / (pow(1 + $dknl / 12, $dkm) - 1); //每月还款金额 $lxTotal = 0; //总利息 for ($i = 0; $i < $dkm; $i++) { $lx = $dkTotal * $dknl / 12; //每月还款利息 $em = $emTotal - $lx; //每月还款本金 echo "第" . ($i + 1) . "期", " 本金:", $em, " 利息:" . $lx, " 总额:" . $emTotal, "
"; $dkTotal = $dkTotal - $em; $lxTotal = $lxTotal + $lx; } echo "总利息:" . $lxTotal; } function debj() { $dkm = 360; //贷款月数，20年就是240个月 $dkTotal = 390000; //贷款总额 $dknl = 0.049; //贷款年利率 $em = $dkTotal / $dkm; //每个月还款本金 $lxTotal = 0; //总利息 for ($i = 0; $i < $dkm; $i++) { $lx = $dkTotal * $dknl / 12; //每月还款利息 echo "第" . ($i + 1) . "期", " 本金:", $em, " 利息:" . $lx, " 总额:" . ($em + $lx), "
"; $dkTotal -= $em; $lxTotal = $lxTotal + $lx; } echo "总利息:" . $lxTotal; } debx(); exit;