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  1. <?php
  2.  
  3. error_reporting(-1);
  4.  
  5. $array = [1, 2, 3];
  6.  
  7. function getFactorial($array){
  8. 	$factorial = 1;
  9. 	for($n = 1; $n<=count($array); $n++){
  10. 		$factorial *= $n;
  11. 	}
  12. 	return $factorial;
  13. }
  14.  
  15. $factorial = getFactorial($array);
  16.  
  17. function getCombination($array){
  18. 	$combination = [];
  19. 	for($n = 0; $n<=(count($array) - 1); $n++){
  20. 		if(($n+1) > (count($array) - 1)){
  21. 			$combination[] = $array[0];
  22. 		} else {
  23. 			$combination[] = $array[$n+1];
  24. 		}
  25. 	}
  26. 	return $combination;
  27. }
  28.  
  29. function Main($factorial, $array){
  30. 	$halfFactorial = $factorial/2;
  31. 	$combination = getCombination($array);
  32. 	while($factorial > 0){
  33. 		$combination = getCombination($combination);
  34. 		if($factorial <= $halfFactorial){
  35. 			krsort($combination);
  36. 		}
  37. 		print_r($combination);
  38. 		$factorial--;
  39. 	}
  40. }
  41.  
  42. Main($factorial, $array);
Success #stdin #stdout 0.02s 25816KB
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Standard input is empty
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Array
(
    [0] => 3
    [1] => 1
    [2] => 2
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)
Array
(
    [0] => 2
    [1] => 3
    [2] => 1
)
Array
(
    [2] => 2
    [1] => 1
    [0] => 3
)
Array
(
    [2] => 3
    [1] => 2
    [0] => 1
)
Array
(
    [2] => 1
    [1] => 3
    [0] => 2
)
https://ideone.com/11ZXON
language:
PHP (php 7.3.5)
created:
2 years ago
visibility:
secret

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