Laravel 8 union() {#collection-method}

union 方法将给定数组添加到集合中。如果给定的数组含有与原集合一样的键，则首选原始集合的值：

$collection = collect([1 => ['a'], 2 => ['b']]);

$union = $collection->union([3 => ['c'], 1 => ['b']]);

$union->all();

// [1 => ['a'], 2 => ['b'], 3 => ['c']]Copy