Hello what is the easiest way to change this array to 1D array, i can do that using for loop or foreach, but i'm curious to check if there is an easier way. THANKS

    [0] => Array
            [id] => 1

    [1] => Array
            [id] => 2

    [2] => Array
            [id] => 3


What should the resulting array look like?

Written by Flavius Stef

Accepted Answer

$output_ar = array_map('array_shift', $input_ar);

The array_shift() function grabs the first key/val pair out of an array and returns the value, so applying it to each of the arrays in your top-level array, and combining the results, will result in a 1-d list of the id's.

If your arrays actually have more info than just the id field in them, then you'd probably want to define a function that specifically pulls out whatever field(s) you want and returns those, and then use that function with array_map.

Written by Amber
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