How to get different values ​​in two arrays in php

In PHP, to get different elements in two arrays, we can use the array_diff() function. This function returns a new array consisting of elements that are present in array 1 but not present in array 2.

The following is an example, assuming that the two arrays we want to compare are $arr1 and $arr2:

$arr1 = array("apple", "banana", "orange");
$arr2 = array("banana", "orange", "pear", "kiwi");
$result = array_diff($arr1, $arr2);
print_r($result); // 输出：Array ( [0] => apple )

In this example, the "apple" element in $arr1 is not in $arr2 appears in, so it is returned to the $result array.

But be aware that array_diff() only compares one-dimensional arrays. If you want to compare multidimensional arrays, you need to write the recursive function yourself. Here is an example of comparing multidimensional arrays:

function array_diff_multi($arr1, $arr2) {
    $diff = array();
    foreach ($arr1 as $key => $value) {
        if (is_array($value) && isset($arr2[$key]) && is_array($arr2[$key])) {
            $diff[$key] = array_diff_multi($value, $arr2[$key]);
        } else {
            if (!in_array($value, $arr2)) {
                $diff[$key] = $value;
            }
        }
    }
    return $diff;
}

$arr1 = array("fruit" => array("apple", "banana", "orange"), "color" => "blue");
$arr2 = array("fruit" => array("banana", "orange", "pear", "kiwi"), "color" => "red");
$result = array_diff_multi($arr1, $arr2);
print_r($result); // 输出：Array ( [fruit] => Array ( [0] => apple ) [color] => blue )

In this example, we create a custom function array_diff_multi(), which can compare two multidimensional arrays. We use recursion to compare the elements of each sub-array.

In short, there are many ways to get different elements of two arrays in PHP. The array_diff() function is one of the simplest and most commonly used methods, but it only works with one-dimensional arrays. If you want to compare multidimensional arrays, you need to use a custom recursive function.

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