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

Try this one:

function array_to1d($a) {
    $out = array();
    foreach ($a as $b) {
        foreach ($b as $c) {
            if (isset($c)) {
                $out[] = $c;
            }
        }
    }
    return $out;
}

Notice that it includes a test to see if the value is set (non-null). An array that's a transposition of an array with rows of varying length will have null values in some cells, and this check can be helpful if you're trying to linearize such a beast.