从JSON数组中获取新的JSON数组[关闭]

Question

I need help in solving this issue in php array_diff. can anyone reslove this for me please.

first array

$array1 = array( [0]=> array( [id]=>1 [name]=>n1)
                [1]=> array( [id]=>2 [name]=>n2) 
                [2]=> array( [id]=>3 [name]=>n3)
              )

second array

$array2 = array( [0]=> array( [id]=>1 [name]=>n1)
              )

output should look like

$outarray =array( 
                [0]=> array( [id]=>2 [name]=>n2) 
                [1]=> array( [id]=>3 [name]=>n3)
               )

Answer 1

Many ways to do this, here's a functional one explicitly comparing the 'id' keys:

$ids = array_map(function ($i) { return $i['id']; }, $array2);
$outarray = array_filter($array1, function ($i) use ($ids) {
    return !in_array($i['id'], $ids);
});

---

More beginner friendly implementation, doing the same thing:

$ids = array();
foreach ($array2 as $value) {
    $ids[] = $value['id'];
}

$outarray = array();
foreach ($array1 as $value) {
    if (!in_array($value['id'], $ids)) {
        $outarray[] = $value;
    }
}