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  1. <?php
  2.  
  3. $a = array('orange', 'apple', 'banana', 'pine');
  4.  
  5. $len  = count($a);
  6. $list = array();
  7.  
  8. for ($i = 1; $i < (1 << $len); $i++) {
  9.     $c = [];
  10.     for ($j = 0; $j < $len; $j++) {
  11.     	if ($i & (1 << $j)) {
  12.     		$c[] = $a[$j];
  13.     	}
  14.     }
  15.     $list[] = $c;
  16. }
  17.  
  18. print_r($list);
Success #stdin #stdout 0.02s 52472KB
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Standard input is empty
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Array
(
    [0] => Array
        (
            [0] => orange
        )

    [1] => Array
        (
            [0] => apple
        )

    [2] => Array
        (
            [0] => orange
            [1] => apple
        )

    [3] => Array
        (
            [0] => banana
        )

    [4] => Array
        (
            [0] => orange
            [1] => banana
        )

    [5] => Array
        (
            [0] => apple
            [1] => banana
        )

    [6] => Array
        (
            [0] => orange
            [1] => apple
            [2] => banana
        )

    [7] => Array
        (
            [0] => pine
        )

    [8] => Array
        (
            [0] => orange
            [1] => pine
        )

    [9] => Array
        (
            [0] => apple
            [1] => pine
        )

    [10] => Array
        (
            [0] => orange
            [1] => apple
            [2] => pine
        )

    [11] => Array
        (
            [0] => banana
            [1] => pine
        )

    [12] => Array
        (
            [0] => orange
            [1] => banana
            [2] => pine
        )

    [13] => Array
        (
            [0] => apple
            [1] => banana
            [2] => pine
        )

    [14] => Array
        (
            [0] => orange
            [1] => apple
            [2] => banana
            [3] => pine
        )

)
https://ideone.com/YE9BII
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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