What are the benefits and drawbacks of using array_udiff() for comparing multidimensional arrays in PHP?

When comparing multidimensional arrays in PHP, array_udiff() can be used to find the difference between two or more arrays by using a user-defined comparison function. This can be useful for finding unique elements across arrays. However, this function may be more complex to implement compared to other array comparison functions and may require a callback function to define the comparison logic. 

// Example of using array_udiff() to compare multidimensional arrays
$array1 = [
    ["id" => 1, "name" => "John"],
    ["id" => 2, "name" => "Jane"],
];

$array2 = [
    ["id" => 1, "name" => "John"],
    ["id" => 3, "name" => "Alice"],
];

// Define a comparison function based on the 'id' key
function compareById($a, $b) {
    return $a['id'] - $b['id'];
}

// Find the difference between $array1 and $array2 based on the 'id' key
$diff = array_udiff($array1, $array2, 'compareById');

print_r($diff);

Keywords

array_udiff multidimensional arrays comparison benefits drawbacks

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