PHP输出多个元素的排列或组合的方法

时间:2022-09-16 15:04:45

实例如下:

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<?php
$arr = array('a','b','c','d');
$result = array();
$t = getCombinationToString($arr, 1);
print_r($t);
$t = getCombinationToString($arr, 2);
$t2 = getunique($t);
print_r($t2);
$t = getCombinationToString($arr, 3);
$t2 = getunique($t);
print_r($t2);
$t = getCombinationToString($arr, 4);
$t2 = getunique($t);
print_r($t2);
 
function getunique($t){
    $t2 = array();
    //print_r($t);
    for($i=0;$i<count($t);$i++){
        $count_list = array_count_values($t[$i]);
        $flag = 1;
        foreach($count_list as $ck=>$cv){
            if($cv>1){
                $flag = 0;
                break;
            }
        }
        if($flag){
            sort($t[$i]);
            $flag2 = 1;
            if($t2){
                foreach($t2 as $t2k=>$t2v){
                    if($t[$i]==$t2v){
                        $flag2 = 0;
                        break;
                    }
                }
            }
            if($flag2){
                $t2[] = $t[$i];
            }
        }
    }
    return $t2;
}
 
function getCombinationToString($arr, $m) {
    if ($m ==1) {
     return $arr;
    }
    $result = array();
    
    $tmpArr = $arr;
    unset($tmpArr[0]);
    for($i=0;$i<count($arr);$i++) {
        $s = $arr[$i];
        $ret = getCombinationToString(array_values($tmpArr), ($m-1), $result);
        
        foreach($ret as $row) {
            //$result[] = $s . $row;
            $temp = array();
            $temp[] = $s;
            if(is_array($row)){
                $temp = array_merge($temp,$row);
            }else{
                $temp[] = $row;
            }
            sort($temp);
            $result[] = $temp;
        }
    }
 return $result;
}
 
?>

共15种排列结果。

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