3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array('Alpha', 'Beta', 'Gamma', 'Sigma'); function depth_picker($arr, $temp_string, &$collect) { if ($temp_string != "") $collect []= $temp_string; for ($i=0; $i<sizeof($arr);$i++) { $arrcopy = $arr; $elem = array_splice($arrcopy, $i, 1); // removes and returns the i'th element if (sizeof($arrcopy) > 0) { depth_picker($arrcopy, $temp_string ." " . $elem[0], $collect); } else { $collect []= $temp_string. " " . $elem[0]; } } } $collect = array(); depth_picker($array, "", $collect); print_r($collect);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => Alpha [1] => Alpha Beta [2] => Alpha Beta Gamma [3] => Alpha Beta Gamma Sigma [4] => Alpha Beta Sigma [5] => Alpha Beta Sigma Gamma [6] => Alpha Gamma [7] => Alpha Gamma Beta [8] => Alpha Gamma Beta Sigma [9] => Alpha Gamma Sigma [10] => Alpha Gamma Sigma Beta [11] => Alpha Sigma [12] => Alpha Sigma Beta [13] => Alpha Sigma Beta Gamma [14] => Alpha Sigma Gamma [15] => Alpha Sigma Gamma Beta [16] => Beta [17] => Beta Alpha [18] => Beta Alpha Gamma [19] => Beta Alpha Gamma Sigma [20] => Beta Alpha Sigma [21] => Beta Alpha Sigma Gamma [22] => Beta Gamma [23] => Beta Gamma Alpha [24] => Beta Gamma Alpha Sigma [25] => Beta Gamma Sigma [26] => Beta Gamma Sigma Alpha [27] => Beta Sigma [28] => Beta Sigma Alpha [29] => Beta Sigma Alpha Gamma [30] => Beta Sigma Gamma [31] => Beta Sigma Gamma Alpha [32] => Gamma [33] => Gamma Alpha [34] => Gamma Alpha Beta [35] => Gamma Alpha Beta Sigma [36] => Gamma Alpha Sigma [37] => Gamma Alpha Sigma Beta [38] => Gamma Beta [39] => Gamma Beta Alpha [40] => Gamma Beta Alpha Sigma [41] => Gamma Beta Sigma [42] => Gamma Beta Sigma Alpha [43] => Gamma Sigma [44] => Gamma Sigma Alpha [45] => Gamma Sigma Alpha Beta [46] => Gamma Sigma Beta [47] => Gamma Sigma Beta Alpha [48] => Sigma [49] => Sigma Alpha [50] => Sigma Alpha Beta [51] => Sigma Alpha Beta Gamma [52] => Sigma Alpha Gamma [53] => Sigma Alpha Gamma Beta [54] => Sigma Beta [55] => Sigma Beta Alpha [56] => Sigma Beta Alpha Gamma [57] => Sigma Beta Gamma [58] => Sigma Beta Gamma Alpha [59] => Sigma Gamma [60] => Sigma Gamma Alpha [61] => Sigma Gamma Alpha Beta [62] => Sigma Gamma Beta [63] => Sigma Gamma Beta Alpha )
preferences:
280.37 ms | 408 KiB | 376 Q