php array walk recursive code example

Example 1: array_walk_recursive get return value

Flatten multidimensional associative array to array

function flatten(array $array, $prefix="") {
    $result = Array();
    array_walk($array, function ($value, $key) use ($array, $prefix, &$result) {
        $path = $prefix ? "$prefix.$key" : $key;
        if (is_array($value)) {
            $result = array_merge($result, flatten($value, $path));
        } else {
            $result[$path] = $value;
        }
    });

    return $result;
}

print_r(flatten($arrr));

from site:
https://stackoverflow.com/questions/39071537/array-walk-recursive-to-return-array-name-rather-than-index-number

Example 2: php array walk recursive

<?php
/*
*   Two Dimensional Arrays:- array_walk_recursive() function is used  
**/
$alphabets = array(
    'a'  =>  'apple',
    'b'  =>  'ball',
    'c' =>  'cat',
    array(
        'd' =>  'dog',
        'e' =>  'elephant',
    )
);

array_walk_recursive($alphabets, 'myFunc2', 'for' );

function myFunc2($value, $key, $param){
    echo "$key $param $value <br>";
};
?>
/*

Out Put
a for apple

b for ball

c for cat

d for dog

e for elephant
*/

Example 3: php array_walk_recursive

$arr = array(1, array(2, 3));
// Call function on every item, even subarrays.
// Sign $item as reference to work on original item.
array_walk_recursive($arr, function(&$item, $key, $myParam){
  $item *= 2;
}, 'will be in myParam');
// $arr now is [2, [4, 6]]