Answers for "extracting data into a multidimensional array php"

convert multidimensional array into single dimension php

$arrayMult = [ ['a','b'] , ['c', 'd'] ];
$arraySingle = call_user_func_array('array_merge', $arrayMult);
// $arraySingle is now = ['a','b', 'c', 'd'];

php access multidimensional array by string

function get_multi($arr, $str) {
    foreach (explode('.', $str) as $key) {
        if (!array_key_exists($key, $arr)) {
            return NULL; 
        }
        $arr = $arr[$key];
    }

    return $arr;
}