您的位置: 首页  >  技术问答  >  如何在没有键和没有循环的情况下将数组键值转换为一个数组？ [重复]

如何在没有键和没有循环的情况下将数组键值转换为一个数组？ [重复]

分类: 技术问答 • 2022-03-16 14:29:43

如何在没有键和没有循环的情况下将数组键值转换为一个数组？ [重复]

问题描述：

This question already has an answer here:

I have this array:

Array
(
    [0] => Array
        (
            [fName] => Alice
            [lName] => Gibson
        )

    [1] => Array
        (
            [fName] => Jack
            [lName] => Smith
        )

    [2] => Array
        (
            [fName] => Bruce
            [lName] => Lee
        )

)

How to get an array with all fName values for instance: 

["Alice","Jack","Bruce"]

What I've tried and worked is: 

foreach($myArray as $info){
       $newArray[] = $info['fName'];      
}

question:

is it possible to use a single function instead of looping?

</div>

此问题已经存在 这里有一个答案： p>

  • 获取多维数组中特定列的所有值 5 answers span> li> ul> div>

    我有这个数组： p> 

      Array 
（
 [0] =＆gt;数组
（
 [fName] =＆gt; Alice 
 [lName] =＆gt; Gibson 
）\  n 
 [1] =＆gt;数组
（
 [fName] =＆gt; Jack 
 [lName] =＆gt; Smith 
）
 
 [2] =＆gt;数组
（
  [fName] =＆gt; Bruce 
 [lName] =＆gt; Lee 
）
 
）
  code>  pre> 
 
 
    如何获取包含所有fName值的数组 F 或实例： p> 
 
 
    

      [“Alice”，“Jack”，“Bruce”] 
  code>  pre> 
 
 
    我是什么 尝试和工作的是： p> 
 
 
    

      foreach（$ myArray as $ info）{
 $ newArray [] = $ info ['fName'];  
} 
  code>  pre> 
 
 
     问题： strong>  p> 
 
 
    是否可以使用单个函数代替 循环？ p> 
  div>

答

You can use array_column

array_column($array, 'fName');

array_column returns all the values in a single column with the specified key.

答

Use array_column.

$fname = array_column($arr, "fName");

https://3v4l.org/OIGNM

答

An alternative is to use array_map() which applies the callback to each element in the array, as follows: 

$arr = [["fName" => "Alice", "lName" => "Gibson"],
        ["fName" => "Jack", "lName" => "Smith"],
        ["fName" => "Bruce", "lName" => "Lee"]];

$arrFnames = array_map(function($e) {
           return $e["fName"];

},$arr);

var_dump($arrFnames);

See live code.

Each element of $arr is an array of first and last names. The anonymous function which serves as a callback returns the value of the element containing the first name.

相关推荐