PHP 实现字符串的所有排列 In PHP | 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051class Test{ /** * arr 元素数组, * m 从arr 中选择的元素个数 * isRepeat arr中的元素是否可以重复 * isSortRepeat arr中的元素排序后是否可以重复 * b 中间变量 * M 等于第一次调用时的 m * res 存放结果 */ public static function combine($arr, $m, $isRepeat = 0, $isSortRepeat = 0, $b = [], $n = 0, $res = []) { !$n && $n = $m; if($m == 1) { foreach($arr as $item) $res[] = array_merge($b, [$item]); } else { foreach($arr as $key => $item) { $b[$n - $m] = $item; $tmp = $arr; if(!$isRepeat) unset($tmp[$key]); $res = self::combine($tmp, $m-1, $isRepeat, $b, $n, $res); } } if($isSortRepeat){ foreach ($res as $key => $value) { asort($value); $res[$key] = $value; } $unique_arr = []; foreach ($res as $key => $value) { $unique_arr[] = implode(',',$value); } $unique_arr = array_unique($unique_arr); $unique_key = array_keys($unique_arr); foreach ($res as $key => $value) { if(!in_array($key,$unique_key)){ unset($res[$key]); } } } return $res; }print_r(Test::combine(['a','b', 'c'], 3)); -------------本文结束感谢您的阅读-------------