我正在执行消除不需要的组合的代码，例如I（ABCDE）不想AAA BBB AB BA只希望ABC ABD ABE ....如此等等，希望它对任何情况都有效，例如我确实工作过的示例代码那样：他在3对3上进行一组组合（1-6）3 …但我希望他对4对4或10到10组合进行（1-15）的组合。理解。
$lista = array(1,2,3,4,5,6); $b=1; for ($i=0; $i<=3; $i++) { for ($j=$b; $j<=4;$j++) { // printf('valor do j = '.$j.'<br>'); for ($k=$j+1; $k<count($lista); $k++) { printf($lista[$i].$lista[$j].$lista[$k].'<br>'); } } $b++; }
结果
123 124 125 126 134 135 136 145 146 156 234 235 236 245 246 256 345 346 356 456
原始代码：我刚刚添加了$len一部分。
$len
<?php // function to generate and print all N! permutations of $str. (N = strlen($str)). function permute($str,$i,$n,$len) { global $ret; if ($i == $n){ if(in_array(substr($str,0,$len),$ret)==false){$ret[]=substr($str,0,$len);} }else { for ($j = $i; $j < $n; $j++) { swap($str,$i,$j); permute($str, $i+1, $n, $len); swap($str,$i,$j); // backtrack. } } } // function to swap the char at pos $i and $j of $str. function swap(&$str,$i,$j) { $temp = $str[$i]; $str[$i] = $str[$j]; $str[$j] = $temp; } $ret = array(); $str = "123456"; permute($str,0,strlen($str), 3); // call the function. print_r($ret); /** * Array ( [0] => 123 [1] => 124 [2] => 125 [3] => 126 [4] => 132 [5] => 134 [6] => 135 [7] => 136 [8] => 143 [9] => 142 [10] => 145 [11] => 146 [12] => 153 [13] => 154 [14] => 152 [15] => 156 [16] => 163 [17] => 164 [18] => 165 [19] => 162 [20] => 213 [21] => 214 [22] => 215 [23] => 216 [24] => 231 [25] => 234 [26] => 235 [27] => 236 [28] => 243 [29] => 241 [30] => 245 [31] => 246 [32] => 253 [33] => 254 [34] => 251 [35] => 256 [36] => 263 [37] => 264 [38] => 265 [39] => 261 [40] => 321 [41] => 324 [42] => 325 [43] => 326 [44] => 312 [45] => 314 [46] => 315 [47] => 316 [48] => 341 [49] => 342 [50] => 345 [51] => 346 [52] => 351 [53] => 354 [54] => 352 [55] => 356 [56] => 361 [57] => 364 [58] => 365 [59] => 362 [60] => 423 [61] => 421 [62] => 425 [63] => 426 [64] => 432 [65] => 431 [66] => 435 [67] => 436 [68] => 413 [69] => 412 [70] => 415 [71] => 416 [72] => 453 [73] => 451 [74] => 452 [75] => 456 [76] => 463 [77] => 461 [78] => 465 [79] => 462 [80] => 523 [81] => 524 [82] => 521 [83] => 526 [84] => 532 [85] => 534 [86] => 531 [87] => 536 [88] => 543 [89] => 542 [90] => 541 [91] => 546 [92] => 513 [93] => 514 [94] => 512 [95] => 516 [96] => 563 [97] => 564 [98] => 561 [99] => 562 [100] => 623 [101] => 624 [102] => 625 [103] => 621 [104] => 632 [105] => 634 [106] => 635 [107] => 631 [108] => 643 [109] => 642 [110] => 645 [111] => 641 [112] => 653 [113] => 654 [114] => 652 [115] => 651 [116] => 613 [117] => 614 [118] => 615 [119] => 612 ) */ ?>
