Again with the lotto program

Question

I had a problem before with a small lottery program that calucaltes all the combinations possible for 6/49 (in PHP).

This is my current problem. I use conditions so the numbers won't repeat, but in the next loop, when the first number is changed I have a repeating combination. Let me explain by an example:

I have this combination:

1 2 3 4
1 2 3 5 
1 2 3 6
...
1 2 4 3
1 2 4 5
1 2 4 6

So my lottery ticket 1 2 3 4 is the same as 1 2 4 3.

Have any ideas how to solve it? I can't think of anything...

Here is the code (I only made it till 4/49 :D )

<?php

for ($i=1 ; $i<50 ; $i++)

{

    $a=$i;
    for ($j=1 ; $j<50 ; $j++)

    {

        if ($i!=$j)
        {
            $b=$j;



                for ($k=1 ; $k<50 ; $k++)

                {

                if ($k!=$j && $k!=$i)
                {
                    $c=$k;

                    for ($l=1 ; $l<50 ; $l++)

                    {

                        if ($l!=$i && $l!=$j && $l!=$k)
                        {
                            $d=$l;
                            echo "$a $b $c $d <br>";
                        }
                    }
                }
            }
        }
    }
 }

 ?>
 <br/><br/>

Thank you !

Update:

the code looks like this:

< ?php

  for($a=1; $a<50; $a++)

  {

     for($b=$a+1; $b<50; $b++)

  {

    for($c=$b+1; $c<50; $c++)

    {

        for($d=$c+1; $d<50; $d++)

        {

            for($e=$d+1; $e<50; $e++)

            {

                for($f=$e+1; $f<50; $f++)

                {

                   $t=$t+1;
                }
            }

        }
    }
  }
 }
 echo "$t";

 ?>

I do get the right answer but I allso get this error: "Undefined variable: t" Any ideea why?

Answer 1

To get all combinations, you should initialize inner loop variable value to parent loop variable value + 1 Example for 4/49

for($a=1; $a<50-3; $a++)
    for($b=$a+1; $b<50-2; $b++)
        for($c=$b+1; $c<50-1; $c++)
            for($d=$c+1; $d<50; $d++)
                echo "$a $b $c $d<br>";

As a bonus, you don't need anymore to test if values are all different