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  1. <?php
  2.  
  3. $AA = array('a','b','c');
  4. $BB = array();
  5.  
  6.     function gen($A, $B, $idx) {
  7.       if ($idx < 0) {
  8.       	    if(sizeof($B)>0)
  9.       	    	print_r($B);
  10.       	    return;
  11.       }
  12.       gen($A, $B, $idx - 1);
  13.       array_unshift($B, $A[$idx]);
  14.       gen($A, $B, $idx - 1);
  15.       return;
  16.    }
  17.  
  18.    gen($AA, $BB, sizeof($AA)-1);
Success #stdin #stdout 0.01s 82560KB
comments (?)
stdin
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Standard input is empty
stdout
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Array
(
    [0] => a
)
Array
(
    [0] => b
)
Array
(
    [0] => a
    [1] => b
)
Array
(
    [0] => c
)
Array
(
    [0] => a
    [1] => c
)
Array
(
    [0] => b
    [1] => c
)
Array
(
    [0] => a
    [1] => b
    [2] => c
)
https://ideone.com/tvjG7O
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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