function SetExposureTime($time)
{
    $registers = GetRegisters();
    $regs = CalcExposureRegisters($time, $registers[82], $registers[85], 12, 250000000);
    SetRegisterValue(71, $regs[0]);
    SetRegisterValue(72, $regs[1]);
}
<?php

include "libraries/func.php";
$reg82 = 4688;
$reg85 = 257;
$bits = 12;
$lvds = 300000000.0;
for ($time = 100; $time < 10000000; $time *= 3) {
    $reg = CalcExposureRegisters($time, $reg82, $reg85, $bits, $lvds);
    $ns0 = CalcExposureTime($reg[1] * 65536 + $reg[0], $reg82, $reg85, $bits, $lvds);
    $new = CalcExposureRegisters($ns0, $reg82, $reg85, $bits, $lvds);
    printf("%04X %04X %04X %04X %04X %04X %10d %10d %d %d\n", $reg[0], $reg[1], $new[0], $new[1], $reg82, $reg85, $time, $ns0, $bits, $lvds);
}
     $registers[73] = strtoupper(dechex($regs[0]));
     SetRegisterValue(74, $regs[1]);
     $registers[74] = strtoupper(dechex($regs[1]));
 }
 if (isset($_POST["exptimekp1apply"]) && $_POST["exptimekp1apply"] == "on") {
     $regs = CalcExposureRegisters($_POST["exptimekp1"], $registers[82], $registers[85], 12, 250000000);
     $alert .= "Exposure Time Kneepoint 1 set to: " . $_POST["exptimekp1"] . " ms<br>\n";
     $alert .= "Register 75 set to: " . $regs[0] . "<br>\n";
     $alert .= "Register 76 set to: " . $regs[1] . "<br>\n";
     SetRegisterValue(75, $regs[0]);
     $registers[75] = strtoupper(dechex($regs[0]));
     SetRegisterValue(76, $regs[1]);
     $registers[76] = strtoupper(dechex($regs[1]));
 }
 if (isset($_POST["exptimekp2apply"]) && $_POST["exptimekp2apply"] == "on") {
     $regs = CalcExposureRegisters($_POST["exptimekp2"], $registers[82], $registers[85], 12, 250000000);
     $alert .= "Exposure Time Kneepoint 2 set to: " . $_POST["exptimekp2"] . " ms<br>\n";
     $alert .= "Register 77 set to: " . $regs[0] . "<br>\n";
     $alert .= "Register 78 set to: " . $regs[1] . "<br>\n";
     SetRegisterValue(77, $regs[0]);
     $registers[77] = strtoupper(dechex($regs[0]));
     SetRegisterValue(78, $regs[1]);
     $registers[78] = strtoupper(dechex($regs[1]));
 }
 if (isset($_POST["blacksunapply"]) && $_POST["blacksunapply"] == "on") {
     $alert .= "Register 102 set to: " . $_POST["blacksun"] + 8192 . "<br>\n";
     $registers[102] = dechex(SetBlackSunProtection($_POST["blacksun"]) + 8192);
 }
 if (isset($_POST["Vtfl3enapply"]) && $_POST["Vtfl3enapply"] == "on" || isset($_POST["Vtfl2enapply"]) && $_POST["Vtfl2enapply"] == "on" || isset($_POST["Vtfl3apply"]) && $_POST["Vtfl3apply"] == "on" || isset($_POST["Vtfl2apply"]) && $_POST["Vtfl2apply"] == "on") {
     $Vtfl3en = $_POST["Vtfl3en"];
     $Vtfl2en = $_POST["Vtfl2en"];