[<> I need help with a PHP code]

No. I am really bad at coding. My teacher didnt give us information. We have to figure it out ourslves. I only know the basics of php and thats NOT enough for this puzzle game. I told my teacher i dont understand several times. He gave me this code of another student, so i could learn how to code it, but i dont understand and he doesnt explain it to me. So thats why i asked for help. 

 

[<> I need help with a PHP code]

Im new to php and want to know what the code means...

[<> I need help with a PHP code]

<>

So ive found this code on the internet, but i dont understand the code. Can someone please help me?

<?php
$numbers= "2323";
$position = "RLRR"; 
$x = 1;

if (isset( $_GET['position'])){
  $position = $_GET['position'];
}

for ($y =0; $y < strlen ($position); $y++) {

  $href = $position;
  $check = $position;
  $color = "red";

  if ( $href [$y] === 'L' ) {
    $href [$y] = 'R';
  } else { 
    $href [$y] = 'L';
  }

  $right = substr ($check, 0, $y);
  $right = str_replace ("L", "", $right);
  $right = strlen ($right);

  $left = substr ($check, $y);
  $left = str_replace ("R", "", $left);
  $left = strlen ($left);

  if ( intval ($numbers [$y]) === $right+$left) {
    $color= "green";
  }

  if (($color ) === "green") {
    $x ++;
  }
?>

  <td class=<?php echo $color; ?> ><?php echo $numbers[$y];?></td>
  <td>
    <a href="?position=<?php echo $href;?>">
    <img class="<?php echo $position [$y];?>" src="Pijllinks.jpg"></a>
  </td>
<?php
} 
if (intval ($x) === 6) {
  $b="green";
} else 
  return 
?>

 

 

[HELP! I need to make a simple PHP puzzle game for school....]

https://informatica.olvbreda.nl/lorenzol/Puzzelspel/Pijlentellen4.php you can try the game here. Please help me, its for a mark.