Here is a quick code snippet for flattening a multi-dimensional array using PHP.
This uses the function array_walk_recursive that applies a function to every element of an array. Using this function we can add the value to a new array and return that instance.
function flatten(array $array) { $return = array(); array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; }); return $return; } print_r(flatten([1, 2, [3], [4, [5, 6], 5, 6], [[7], [8, [9]]], 10, [[[11], 12]]])); Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 5 [7] => 6 [8] => 7 [9] => 8 [10] => 9 [11] => 10 [12] => 11 [13] => 12 ) 
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