检查另一个数组中的键值对是否存在于另一个数组中-具有不同的键名（php） [英] Check if key-value pair from one array exists in another – with different key name (php)

问题描述

我正在编辑此问题，因为我的数组实际上应该是多维数组。

I am editing this question as my arrays should in fact have been multidemensional arrays.

我希望通过 $ array_food 进行迭代。我想打印 snack->'banana'的值，但仅当 food->'banana'存在于单独的数组 $ array_healthyfood 。

I wish to iterate though $array_food. I would like to print the the value of snack->'banana' but only if food->'banana' exists in a separate array, $array_healthyfood.

$array_food = array (
[0] => Array
    (
    snack  => 'banana',
    breakfast => 'cereal',
    drink => 'water'
    )

[1] => Array
    (
    snack  => 'apple',
    breakfast => 'eggs',
    drink => 'juice'
    )
)

$array_healthyfood = array (
[0] => Array
    (
    food  => 'banana',
    breakfast => 'cereal',
    drink => 'water'
    )

[1] => Array
    (
    food  => 'apple',
    breakfast => 'eggs',
    drink => 'juice'
    )
)

我尝试了以下操作：

<?php foreach ($array_food as $foodelement):
if (in_array($foodelement->snack->$fruit, $array_healthyfood)) {
echo $foodelement->snack->$fruit;
}
endforeach; ?>

任何指针都会受到赞赏。

Any pointers appreciated.

推荐答案

如何确定健康食品数组中是否存在一个特定项目：

How to figure out whether one particular item exists in the healthy foods array:

array_reduce($healthyFood, function ($exists, array $hf) {
    return $exists || $hf['food'] == 'Banana';
})

（这可以通过普通循环，自定义函数或许多其他方式来完成。我在这里选择了函数数组归约。）

(This can be done with a normal loop, or a custom function, or many other ways. I've chosen a functional array reduction here.)

如何对数组中的每个项目执行此操作：

How to do this for each item in an array:

foreach ($foods as $food) {
    $exists = array_reduce($healthyFood, function ($exists, array $hf) use ($food) {
        return $exists || $hf['food'] == $food['snack'];
    });
    if ($exists) ..
}

如何过滤食物按健康食品分类：

How to filter the food array by healthy foods:

$foods = array_filter($foods, function (array $food) use ($healthyFood) {
    return array_reduce($healthyFood, function ($exists, array $hf) use ($food) {
        return $exists || $hf['food'] == $food['snack'];
    });
});

与连续循环健康食品阵列相比，如何更有效地做到这一点：

How to do this more efficiently than continuously looping the healthy foods array:

$healthyFoods = array_map(function (array $hf) { return $hf['food']; }, $healthyFoods);

foreach ($foods as $food) {
    if (in_array($food['snack'], $healthyFoods)) ...
}

这篇关于检查另一个数组中的键值对是否存在于另一个数组中-具有不同的键名（php）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！