仅在php中使用数组函数从多维数组获取具有特定条件的特定列 [英] get specific column with specific condition from multidimensional array using array function only in php

问题描述

我只想使用数组函数从多维数组中获得索引为 0,1,2 的具有特定条件的特定键.

i want to get specific key with specific condition with indexing 0,1,2 from multidimensional array using array function only.

正在使用forloop，但是我希望它使用数组函数进行代码优化

using forloop it is getting but i want it using array function for code optimization

我的输入代码如下:

Array
(
    [0] => Array
        (
            [device_token] => 1324
            [device_type] => 0
        )    
    [1] => Array
        (
            [device_token] => 2546
            [device_type] => 1
        )    
    [2] => Array
        (
            [device_token] => 13241
            [device_type] => 0
        )    
    [3] => Array
        (
            [device_token] => 12345
            [device_type] => 1
        )    
)

并且我只希望具有 device_type = 0 且具有以下格式的device_token:

and i want only device_token which have device_type=0 with following format like :

Array
    (
        [0] => 1324,
        [1] => 13241,
)

我正在尝试以下代码:

$ios_token = array_map(function($r) {
            return $r['device_token'];
        }

这给了我所有的设备令牌.

this give me device token of all.

推荐答案

array_filter应该为您做到:

array_filter should do it for you :

http://php.net/manual/en/function.array-filter.php

$ios_token = array_filter($myArray, function($item) {
    return $item['device_type'] == 0;
});

迭代每个值，如果回调函数返回true，则返回数组的当前值.

It iterates over each value and if the callback function returns true, the current value of the array is returned.

然后，您可以像执行操作一样在array_map函数中传递变量:

Then you could pass your variable in an array_map function like you did :

$ios_token = array_map(function($item){
    return $item['device_token'];
}, $ios_token);

如果要对所有内容进行分组:

And if you want to group everything :

$ios_token = array_map(function($item){
    return $item['device_token'];
}, array_filter($myArray, 
    function($item) {
        return $item['device_type'] == 0;
    }
));

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