将多维数组转换为简单数组

Question

When print_r($my_array);

Array
(
    [0] => Array
        (
            [value] => num1
            [label] => 
        )

    [1] => Array
        (
            [value] => num2
            [label] => 
        )

    [2] => Array
        (
            [value] => num3
            [label] => 
        )

)

Now I wonder how to create a new array variable to hold only 1 level with the following structure. e.g:

if print_r($new_array), it will show:

Array
(
    [0] => num1

    [1] => num2

    [2] => num3

)

Answer 1

Try foreach() and store value in new array

foreach($arr as $v) {
  $newarr[] = $v['value']; 
}
print_r($newarr);