php 二维数组差集

以下是PHP二维数组差集的两种方法：

方法一：使用array_udiff()函数

function compare($a, $b) {
    return $a['id'] - $b['id'];
}

$arr1 = array(
    array('id' => 101, 'name' => 'Tom', 'age' => 20),
    array('id' => 102, 'name' => 'ptbird', 'age' => 19),
    array('id' => 103, 'name' => 'Jerry', 'age' => 18)
);

$arr2 = array(
    array('id' => 101, 'name' => 'Tom', 'age' => 20),
    array('id' => 103, 'name' => 'Jerry', 'age' => 18)
);

$result = array_udiff($arr1, $arr2, 'compare');
print_r($result);

方法二：使用array_filter()函数

function diff($a, $b) {
    return $a['id'] - $b['id'];
}

$arr1 = array(
    array('id' => 101, 'name' => 'Tom', 'age' => 20),
    array('id' => 102, 'name' => 'ptbird', 'age' => 19),
    array('id' => 103, 'name' => 'Jerry', 'age' => 18)
);

$arr2 = array(
    array('id' => 101, 'name' => 'Tom', 'age' => 20),
    array('id' => 103, 'name' => 'Jerry', 'age' => 18)
);

$result = array_filter($arr1, function($a) use ($arr2, $diff) {
    return count(array_filter($arr2, function($b) use ($a, $diff) {
        return $diff($a, $b) == 0;
    })) == 0;
});

print_r($result);