如何查找之前在多数组中找到的值

Question

我目前确实遇到了以下问题。我必须检查数组是否包含完全相同的值以及之前是否找到它们。

int(3) 之前没有找到所以它是 0，之前没有找到 int(8)，所以它是 0，之前没有找到 int(5)，所以它是 0，之前找到了 int(8) 所以它是 1， int(3) 和 int(8) 未同时找到，因此为 0，依此类推。

我已经用 array_unique 试过了，但没有达到我想要的效果

例如：

array(7) {
  [2] => array(1) {
    [0] => int(3)
  }
  [3] => array(1) {
    [0] => int(8)
  }
  [4] => array(1) {
    [0] => int(5)
  }
  [5] => array(1) {
    [0] => int(8)
  }
  [6] => array(2) {
    [0] => int(3)
    [1] => int(8)
  }
  [7] => array(2) {
    [0] => int(2)
    [1] => int(5)
  }
  [8] => array(2) {
    [0] => int(3)
    [1] => int(8)
  }
}

它一定是这个样子

array(7) {
  [2] => array(1) {
    [0] => int(0)
  }
  [3] => array(1) {
    [0] => int(0)
  }
  [4] => array(1) {
    [0] => int(0)
  }
  [5] => array(1) {
    [0] => int(1)
  }
  [6] => array(1) {
    [0] => int(0)
  }
  [7] => array(1) {
    [0] => int(0)
  }
  [8] => array(1) {
    [0] => int(1)
  }
}

Answer 1

<?php
$new_array = array();
$indicator = array();
$current_array = array(
    "2" => array(3),
    "3" => array(8),
    "4" => array(5),
    "5" => array(8),
    "6" => array(3,8),
    "7" => array(2,5),
    "8" => array(3,8),
    );


foreach($current_array as $key => $value){
    if(!in_array($value, $new_array, true)){
        $new_array[$key] = $value;
        $indicator[$key] = false;
    } else {
        $indicator[$key] = true;
    }
}

var_dump($indicator);

Answer 2

您可以使用 array_map() 和 serialize():

<?php

$data = [
    2 => [
        3,
    ],
    3 => [
        8,
    ],
    4 => [
        5,
    ],
    5 => [
        8,
    ],
    6 => [
        3,
        8,
    ],
    7 => [
        2,
        5,
    ],
    8 => [
        3,
        8,
    ],
];

$occurrences = [];

$mapped = array_map(function (array $values) use (&$occurrences) {
    // create serialized representation of the values
    // which we can use as an index 
    $index = serialize($values);

    // haven't seen these values before
    if (!array_key_exists($index, $occurrences)) {
        $occurrences[$index] = 1;

        return 0;
    }

    // increase our counter
    $occurrences[$index]++;

    return $occurrences[$index] - 1;
}, $data);

var_dump($mapped);

参考：

有关示例，请参阅：

https://3v4l.org/oWBcS

如何查找之前在多数组中找到的值

How to find values which were found before inside multi array

php

arrays

unique

find