某些业务场景下，我们会用到组合穷举方法，这里整理几个穷举方法
1、不限顺序的数组组合穷举：
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<?php /** * @param $arr 需要组合数组 * @param int $num 组合元素个数 * @return array */ function getSequenceAry($arr,$num=1) { $count = count($arr); $min = min($count,$num); if($min<1){ return false; } $return =array(); for(;$min>=1;$min--){ $arrRet = array(); $max = $count-($min-1); for($i=0;$i<$max;$i++){ getSequenceArySub($arr,$count,$min,$i,$arrRet,$return); } } return $return; } function getSequenceArySub($arr,$count,$min,$i,$arrRet=array(),& $return){ if(empty($arr) || empty($count)) return false; if(1==$min){ $arrRet[--$min] = $arr[$i]; $return[] = $arrRet; }else{ $arrRet[--$min] = $arr[$i]; for($j = $i+1;$j<($count);$j++){ getSequenceArySub($arr,$count,$min,$j,$arrRet,$return); } } } print_r(getSequenceAry(array(1,2,3,4,5),1)); print_r(getSequenceAry(array(1,2,3,4,5),2)); print_r(getSequenceAry(array(1,2,3,4,5),3)); print_r(getSequenceAry(array(1,2,3,4,5),4)); print_r(getSequenceAry(array(1,2,3,4,5),5)); |
结果：
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Array ( [0] => Array ( [0] => 1 ) [1] => Array ( [0] => 2 ) [2] => Array ( [0] => 3 ) [3] => Array ( [0] => 4 ) [4] => Array ( [0] => 5 ) ) Array ( [0] => Array ( [1] => 1 [0] => 2 ) [1] => Array ( [1] => 1 [0] => 3 ) [2] => Array ( [1] => 1 [0] => 4 ) [3] => Array ( [1] => 1 [0] => 5 ) [4] => Array ( [1] => 2 [0] => 3 ) [5] => Array ( [1] => 2 [0] => 4 ) [6] => Array ( [1] => 2 [0] => 5 ) [7] => Array ( [1] => 3 [0] => 4 ) [8] => Array ( [1] => 3 [0] => 5 ) [9] => Array ( [1] => 4 [0] => 5 ) ) Array ( [0] => Array ( [2] => 1 [1] => 2 [0] => 3 ) [1] => Array ( [2] => 1 [1] => 2 [0] => 4 ) [2] => Array ( [2] => 1 [1] => 2 [0] => 5 ) [3] => Array ( [2] => 1 [1] => 3 [0] => 4 ) [4] => Array ( [2] => 1 [1] => 3 [0] => 5 ) [5] => Array ( [2] => 1 [1] => 4 [0] => 5 ) [6] => Array ( [2] => 2 [1] => 3 [0] => 4 ) [7] => Array ( [2] => 2 [1] => 3 [0] => 5 ) [8] => Array ( [2] => 2 [1] => 4 [0] => 5 ) [9] => Array ( [2] => 3 [1] => 4 [0] => 5 ) ) Array ( [0] => Array ( [3] => 1 [2] => 2 [1] => 3 [0] => 4 ) [1] => Array ( [3] => 1 [2] => 2 [1] => 3 [0] => 5 ) [2] => Array ( [3] => 1 [2] => 2 [1] => 4 [0] => 5 ) [3] => Array ( [3] => 1 [2] => 3 [1] => 4 [0] => 5 ) [4] => Array ( [3] => 2 [2] => 3 [1] => 4 [0] => 5 ) ) Array ( [0] => Array ( [4] => 1 [3] => 2 [2] => 3 [1] => 4 [0] => 5 ) ) |
2、穷举排列组合的函数
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<?php function getSequenceAry($arr) { if (count($arr) == 1) { return array($arr); } $arrRet = array(); foreach ($arr as $k => $v) { $arr2 = $arr; unset($arr2[$k]); $arrOrderList = getSequenceAry($arr2); foreach ($arrOrderList as $order) { array_unshift($order, $v); $arrRet[] = $order; } } return $arrRet; } function getSequenceStr($arr) { if (count($arr) == 1) { return $arr; } $arrRet = array(); foreach ($arr as $k => $v) { $arr2 = $arr; unset($arr2[$k]); $arrOrderList = getSequenceStr($arr2); foreach ($arrOrderList as $order) { $arrRet[] = $v . $order; } } return $arrRet; } print_r(getSequenceAry(array(1,2,3))); print_r(getSequenceStr(array(1,2,3))); ------------------ output ------------------ Array ( [0] => Array ( [0] => 1 [1] => 2 [2] => 3 ) [1] => Array ( [0] => 1 [1] => 3 [2] => 2 ) [2] => Array ( [0] => 2 [1] => 1 [2] => 3 ) [3] => Array ( [0] => 2 [1] => 3 [2] => 1 ) [4] => Array ( [0] => 3 [1] => 1 [2] => 2 ) [5] => Array ( [0] => 3 [1] => 2 [2] => 1 ) ) Array ( [0] => 123 [1] => 132 [2] => 213 [3] => 231 [4] => 312 [5] => 321 ) |
穷举排列组合的函数
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2017年10月18日 上午 10:19 套图网 | 引用 | #31
阅读博客获得的进步不亚于阅读一本书。