Question

我正在尝试使用php数组中的组显示值重复其中的次数。示例：考虑该数组。（json_encode输入）

[[6],[6],[6],[5,1],[3,3],[3,3],[3,2,1]]

结果，我需要的是一组数组以及它们的数量，如下所示：

[[6],3],
[[5,1],1],
[[3,3],2],
[[3,2,1],1],

任何类型？

EDIT

我尝试使用以下语句：

$result = array();
foreach ($myarray as $element) {
    $result[$element[0]][] = $element;
}

但是我得到了这样的解决方案：

{"6":[[6],[6],[6]],"5":[[5,1]],"3":[[3,3],[3,3],[3,2,1]]}

问题出在3组上，我需要分别将[3,3]和[3,2,1]分组。

Answer 1

这似乎可以满足您的要求。

<?php
    //This is your array of elements
    $array = [[6],[6],[6],[5,1],[3,3],[3,3],[3,2,1]];

    //This is a list of items that the program knows about, and their position
    $known_items = array();

    //For all the elements
    foreach($array as $item){
        //Sort the array to be in ascending order so that any combination will work
        asort($item);

        //We only want the item array to have values, and not keys
        $item = array_values( $item );

        //Make the content of this item a string so we can use it as a key in arrays
        $arrString = json_encode( $item );

        //Have we seen this item before?
        if( array_key_exists( $arrString , $known_items ) ){
            //Yes we have, increase the count
            $known_items[ $arrString ][1]++;
        } else {
            //No we haven't. Add it and start the count as 1
            $known_items[ $arrString ] = [ $item, 1 ];
        }

    }

    echo json_encode( array_values( $known_items), JSON_PRETTY_PRINT);

用多维数组重复项对php数组进行分组和计数

1 个答案: