Array_diff在foreach？ [英] Array_diff in foreach?

问题描述

我需要比较一些数组中的值。
这个数组是多维的，我需要比较内部数组。

I need to compare values from some arrays. This array is multi dimensional and I need to compare the arrays inside.

在这里转储：

php

php

    array (size=4)
  1 => 
    array (size=3)
      0 => string '96' (length=2)
      1 => string '90' (length=2)
      2 => string '91' (length=2)
  2 => 
    array (size=3)
      0 => string '96' (length=2)
      1 => string '90' (length=2)
      2 => string '91' (length=2)
  3 => 
    array (size=4)
      0 => string '96' (length=2)
      1 => string '90' (length=2)
      2 => string '91' (length=2)
      3 => string '98' (length=2)
  4 => 
    array (size=4)
      0 => string '96' (length=2)
      1 => string '90' (length=2)
      2 => string '91' (length=2)
      3 => string '98' (length=2)

我想使用之类的东西array_diff ，比较不同的数组，但是...即使看起来很愚蠢，我也不知道该怎么做。
我想我希望提取这4个数组，以便能够比较它们。

I wanted to use something like array_diff, to compare the different arrays but... even if it seems stupid, I don't know how to do it. I guess I expect to "extract" the 4 array, to be able to compare them.

是否有人可以向我解释一个很好的方法这个 ？
非常感谢。

Is there somebody that can explain me a good way to do this ? Thank you very much.

推荐答案

<?php

$arr = [
    ['96','90','91'],
    ['96','90','91'],
    ['96','90','91','98'],
    ['96','90','91','98'],
];

$set = [];

foreach ($arr as $values) {
    foreach($values as $each_value){
        if(!isset($set[$each_value])) $set[$each_value] = true;
    }
}

$result = [];

$set = array_keys($set);

foreach ($arr as $values) {
    foreach($set as $value){
        if(!in_array($value,$values)) $result[] = $value;
    }
}

$result = array_unique($result);

print_r($result);

演示： https://3v4l.org/gMZUR

• 我们首先进行设置每个数组中存在的元素数量。


• 稍后，我们再次遍历所有数组，并针对每个数组值检查集合中的每个元素。


• 如果我们在集合中发现每个单独的子数组中都不存在的元素，则将其添加到结果中。


• 请注意，我们可以计算元素的频率并将其与实际数据集的大小进行比较，但是重复的值可能会引起问题。

• We first make a set of elements to be present across each array.
• Later, we move across all arrays once again and check each element in the set against each array values.
• If we find an element in the set not present in any of the each individual sub arrays, we add it in the result.
• Note that we can count frequency of element and compare it with the size of the actual data set, but duplicate values could cause issues.

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