php - Multidimensional array to array

Question

I often have a 2-dimensional array:

array(
  array('key' => 'value1'),
  array('key' => 'value2'),
  ...
);

And need to form a 1-dimensional array:

array('value1', 'value2')

This can easily be done with foreach, but I wonder if there's some php 5.3 way to do it in one line.

Answer 1

$new_array = array_map(function($el) { return $el['key']; }, $array);