您可以使用略有不同的循环.

You can use a slightly different loop.

foreach ($var as $item) {
    if ($item['id'] == 2) {
        $newvar = $item;
        break;
    }
}

您还可以使用array_filter

You could also use array_filter

$id = 2;
$newvar = array_filter($var, function($x) use ($id) { return $x['id'] == $id; });

但是它很可能效率较低，因为它必须检查数组的每个元素.

but it would most likely be less efficient as it would have to check every element of the array.