PHP 5.6展平具有多个字段的多维数组

Question

I have a multidimensional array that looks like this:

array (size=2)
  0 => 
    array (size=3)
      'a1' => boolean true
      'b1' => string 'abc' (length=6)
      'c1' => string 'def' (length=8)
  1 => 
    array (size=5)
      'a2' => boolean true
      'b2' => string 'fgh' (length=6)
      'c2' => string 'ijk' (length=8)
      'd2' => string 'lmn' (length=4)
      'e2' => string 'opq' (length=4)

And my goal is to get this:

array (size=8)
  'a1' => boolean true
  'b1' => string 'abc' (length=6)
  'c1' => string 'def' (length=8)
  'a2' => boolean true
  'b2' => string 'fgh' (length=6)
  'c2' => string 'ijk' (length=8)
  'd2' => string 'lmn' (length=4)
  'e2' => string 'opq' (length=4)

I've tried something with the array_map function but I don't know how to get all fields:

$params = array_map(function($element) {
    return $element['a1'];
}, $params);

Answer 1

Try to use this :

function array_flatten($array) {
    if (!is_array($array)) {
        return FALSE;
    }
    $result = array();
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $result = array_merge($result, array_flatten($value));
        }
        else {
            $result[$key] = $value;
        }
    }
    return $result;
}

I test it with :

$array = array(
    0 => array(
        'a1' => true,
        'b1' => 'abc',
        'c1' => 'def',
    ),
    1 => array(
        'a2' => true,
        'b2' => 'fgh',
        'c2' => 'ijk',
        'd2' => 'lmn',
        'e2' => 'opq'
    )
);

$result = array_flatten($array);

var_dump($result);

The output is :

array (size=8)
    'a1' => boolean true
    'b1' => string 'abc' (length=3)
    'c1' => string 'def' (length=3)
    'a2' => boolean true
    'b2' => string 'fgh' (length=3)
    'c2' => string 'ijk' (length=3)
    'd2' => string 'lmn' (length=3)
    'e2' => string 'opq' (length=3)

But I prefer to be honnest, I think it's a function I got from a duplicate question, can't find it again ! But I used it to "flatten" some array and it works well :)