How to Find Dissimilar Nested Arrays within Multidimensional Arrays?

Find Dissimilar Nested Arrays in Multidimensional Arrays

Consider the following two arrays containing associative rows of information:

$pageids = [
    ['id' => 1, 'linklabel' => 'Home', 'url' => 'home'],
    ['id' => 2, 'linklabel' => 'Graphic Design', 'url' => 'graphicdesign'],
    ['id' => 3, 'linklabel' => 'Other Design', 'url' => 'otherdesign'],
    ['id' => 6, 'linklabel' => 'Logo Design', 'url' => 'logodesign'],
    ['id' => 15, 'linklabel' => 'Content Writing', 'url' => 'contentwriting'],
];

$parentpage = [
    ['id' => 2, 'linklabel' => 'Graphic Design', 'url' => 'graphicdesign'],
    ['id' => 3, 'linklabel' => 'Other Design', 'url' => 'otherdesign'],
];

Our task is to identify and return the associative rows present in $pageids but absent in $parentpage. However, using array_diff_assoc() on the first level of these arrays doesn't provide the desired result.

To overcome this challenge, we can leverage a combination of array_map() and serialize() functions. This approach converts each sub-array into a string representation, effectively flattening the multidimensional structure.

$pageWithNoChildren = array_map('unserialize',
    array_diff(array_map('serialize', $pageids), array_map('serialize', $parentpage)));

1. array_map('serialize', $pageids): Converts each sub-array in $pageids into a string representing its structure.
2. array_map('serialize', $parentpage): Same process for $parentpage.
3. array_diff(): Compares the string representations and returns an array of differences.
4. array_map('unserialize', ...): Converts the string differences back into sub-arrays to restore the desired structure.

The resulting $pageWithNoChildren array contains the sub-arrays from $pageids that are not present in $parentpage:

array (
  0 => 
  array (
    'id' => 1,
    'linklabel' => 'Home',
    'url' => 'home',
  ),
  3 => 
  array (
    'id' => 6,
    'linklabel' => 'Logo Design',
    'url' => 'logodesign',
  ),
  4 => 
  array (
    'id' => 15,
    'linklabel' => 'Content Writing',
    'url' => 'contentwriting',
  ),
)

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