2d multidimensional array to 1d array in php

Question

Just wondering if anyone has transformed a 2 dim array to a one dim array in php. I\'ve yet to come across a clear explanation in php. Any suggestion would be appreciated.

Answer 1

It depends on what you need but if you want to reduce your 2d array to a 1d curve that completley fills the 2d plane you probably looking for a spatial index or a space-filling-curve. There are some famous and not so known like the z-curve, the hilbert curve, the peano curve or the moore curve. You can write such a curve with a L-system.

Answer 2

Try this:

function array_2d_to_1d ($input_array) {
    $output_array = array();

    for ($i = 0; $i < count($input_array); $i++) {
      for ($j = 0; $j < count($input_array[$i]); $j++) {
        $output_array[] = $input_array[$i][$j];
      }
    }

    return $output_array;
}