PHP - Reorder Query Strings Depending On Variables

Hello there, i`m trying to figure out a way to reorder a query string depending on variables.

So the url would have the following query:
/result/index.php?page=Weissenfels+Clack+and+Go&tyre=155_70_12&option1=30_02&option2=43_02&v_t=car&options=2

It should depend what page they come from if the page is equal to option2 then option1 is op1 and option2 is op2

To make it myself easier i have converted some variables
On every first two digits ie 43 from the 43_02 can have 13 different ending digits, ie _03 or _04 or _05 etc...

So i have converted all 43_02 43_03 etc to one variable ie $chain1 or $chain2 which holds in this case 43

a 43 is equal to Weissenfels+Clack+and+Go

in the index page i have included the following process.

At the moment i can only use php coding, unfortunately no mysql atm

thank you in advance.

Code: [Select]
<?php


$tyre = $_GET['tyre'];  // finds the tyre size
$op1 = $_GET['option1'];  // finds the first chain size if applicable
$op2 = $_GET['option2'];  // finds the second chain size if applicable
$op3 = $_GET['option3'];  // finds the third chain size if applicable
$op4 = $_GET['option4'];  // finds the fourth chain size if applicable
$op5 = $_GET['option5'];  // finds the fith chain size if applicable
$op6 = $_GET['option6'];  // finds the sixth chain size if applicable
$op7 = $_GET['option7'];  // finds the seventh chain size if applicable
$op8 = $_GET['option8'];  // finds the eighth chain size if applicable
$options = $_GET['options'];
$page = $_GET['page'];
$error = $_GET['info'];
$vehicle_type = $_GET['v_t']; // finds the vehicle type

$b = "Weissenfels+WeissTech+Tecna";
$c = "Weissenfels+Clack+and+Go";


if (($op1 == "30_02") || ($op1 == "30_03"))
{
$chain1 = "m30";
}

elseif (($op2 == "43_02") || ($op2 == "43_03"))
{
$chain2 = "m43";
}
else echo "error";

switch ($page)
{
case (($page == $c) && ($chain1 == "m43"));
$option1 = $op1;
$option2 = $op2;
break;
case (($page == $c) && ($chain2 == "m43"));
$option1 = $op2;
$option2 = $op1;
break;
default;
        $option1 = $op1;
$option2 = $op2;
    break;
}

if ($options=="1") // calculates the possible combination
{

// outputs the results

include 'options_1.php'; // type the amount of possible chains in here ie options_3 options_4 etc

}

elseif ($options=="2")
{
// outputs the results

include 'options_2.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}

elseif ($options=="3")
{
// outputs the results

include 'options_3.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}

elseif ($options=="4")
{
// outputs the results

include 'options_4.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}

elseif ($options=="5")
{
// outputs the results

include 'options_5.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}

elseif ($options=="6")
{
// outputs the results

include 'options_6.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}

elseif ($options=="7")
{
// outputs the results

include 'options_7.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}

elseif ($options=="8")
{
// outputs the results

include 'options_8.php'; // type the amount of possible chains in here ie options_3 options_4 etc
}


else
echo "there is an error on process_action2";


?>