在本文中,我們將深入研究一種方法來檢索一維數組中元素的所有可能組合PHP 中的一維數組。與其他解決方案相比,這種方法確保同時考慮組合和排列。
給定一個字串或數字數組,目標是產生所有可能的元素組合,考慮到不同的安排。例如,「Alpha Beta」和「Beta Alpha」是應該包含在輸出中的不同組合。
提供的PHP 解決方案採用遞歸深度優先搜尋演算法:
<code class="php"><?php $array = array('Alpha', 'Beta', 'Gamma', 'Sigma'); function depth_picker($arr, $temp_string, &$collect) { if ($temp_string != "") $collect []= $temp_string; for ($i=0, $iMax = sizeof($arr); $i < $iMax; $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); ?></code>
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 )提供的程式碼產生以下輸出,其中包含給定數組中元素的所有組合和排列:
以上是如何在 PHP 中產生一維數組中所有可能的元素組合和排列?的詳細內容。更多資訊請關注PHP中文網其他相關文章!