Convert array of single-element arrays to a one-dimensional array

Question

I have this kind of an array containing single-element arrays:

$array = [[88868], [88867], [88869], [88870]];

I need to convert this to one dimensional array.

Desired output:

[88868, 88867, 88869, 88870]

Is there any built-in/native PHP functionality for this array conversion?

Answer 1

For your limited use case, this'll do it:

$oneDimensionalArray = array_map('current', $twoDimensionalArray);

This can be more generalized for when the subarrays have many entries to this:

$oneDimensionalArray = call_user_func_array('array_merge', $twoDimensionalArray);