php 如何从另一个数组的键的值创建一个数组？
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How can I create an array from the values of another array's key?
提问by newbtophp
I have an array as follows:
我有一个数组如下：
$arr1 = array(
0 => array(
'name' => 'tom',
'age' => 22
),
1 => array(
'name' => 'nick',
'age' => 18
)
);
However I want to create an array from it which consists of all the names, so it would become:
但是我想从中创建一个包含所有名称的数组，因此它将变为：
$arr2 = array('tom', 'nick');
I have looked at array_filter(), but that would not work as this is a multi-dimensional array!
我看过了array_filter()，但这不起作用，因为这是一个多维数组！
Question
题
How can I create an array with the values of a specific key (name) from another multi-dimensional array?
如何使用name来自另一个多维数组的特定键 ( )的值创建数组？
回答by jwueller
Newer versions of PHP allow using array_map()with a function expression instead of a function name:
较新版本的 PHP 允许使用array_map()函数表达式而不是函数名：
$arr2 = array_map(function($person) {
return $person['name'];
}, $arr1);
But if you are using a PHP < 5.3, it is much easier to use a simple loop, since array_map()would require to define a (probably global) function for this simple operation.
但是，如果您使用的是 PHP < 5.3，则使用简单循环要容易得多，因为array_map()需要为这个简单的操作定义一个（可能是全局的）函数。
$arr2 = array();
foreach ($arr1 as $person) {
$arr2[] = $person['name'];
}
// $arr2 now contains all names
回答by JVT
This can be done in still more simple way by using array_column
这可以通过使用array_column以更简单的方式完成
$arr2= array_column($arr1, 'name');
print_r($arr2); //Array ( [0] => tom [1] => nick )
array_column is used to get the columns of a sub-array.
array_column 用于获取子数组的列。
回答by Dejan Marjanovic
$array = array(0 => array('name' => 'tom', 'age' => 22), 1 => array('name' => 'nick', 'age' => 18));
foreach($array as $arr => $a){
$names[] = $array[$arr]["name"];
}
print_r($names); //Array ( [0] => tom [1] => nick )
回答by Usama
if you are using Laravel, then simply use array_pluck:
如果您使用的是 Laravel，那么只需使用array_pluck：
$arr2 = array_pluck($arr1 , 'name');
