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Laravel 8 whereNotNull() {#collection-method

whereNotNull 方法筛选给定键不为 NULL 的项：

$collection = collect([
    ['name' => 'Desk'],
    ['name' => null],
    ['name' => 'Bookcase'],
]);

$filtered = $collection->whereNotNull('name');

$filtered->all();

/*
    [
        ['name' => 'Desk'],
        ['name' => 'Bookcase'],
    ]
*/
Laravel 8 whereNotInStrict() {#collection-method}#
Laravel 8 whereNull() {#collection-method}
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