laravel 获取后如何取消设置（删除）集合元素？

How to unset (remove) a collection element after fetching it?

提问by Skeletor

I have a collection which I want to iterate and modify while I fetch some of its elements. But I could't find a way or method to remove that fetched element.

我有一个集合，我想在获取其中的一些元素时对其进行迭代和修改。但是我找不到删除该获取元素的方法或方法。

$selected = []; 
foreach ($collection as $key => $value) {
      if ($collection->selected == true) {
          $selected[] = $value;
          unset($value);
      }
}

This is just a representation of my question for demonstration.

这只是我的演示问题的代表。

After @Ohgodwhy advice the forget() function I checked it again and saw that I actually misunderstood the function. It was exactly as I was looking for.

在@Ohgodwhy 建议忘记() 函数后，我再次检查它，发现我实际上误解了该函数。这正是我所寻找的。

So for working solution I have added $collection->forget($key)inside the if statement.

所以对于工作解决方案，我$collection->forget($key)在 if 语句中添加了。

Below is the working solution of my problem, using @Ohgodwhy's solution:

以下是我的问题的工作解决方案，使用@Ohgodwhy 的解决方案：

$selected = []; 
foreach ($collection as $key => $value) {
      if ($collection->selected == true) {
          $selected[] = $value;
          $collection->forget($key);
      }
}

(this is just a demonstration)

（这只是一个演示）

回答by Ohgodwhy

You would want to use ->forget()

你想用 ->forget()

$collection->forget($key);

Link to the forget method documentation

链接到忘记方法文档

回答by huuuk

Or you can use rejectmethod

或者你可以使用reject方法

$newColection = $collection->reject(function($element) {
    return $item->selected != true;
});

or pullmethod

或pull方法

$selected = []; 
foreach ($collection as $key => $item) {
      if ($item->selected == true) {
          $selected[] = $collection->pull($key);
      }
}

回答by andrewtweber

Laravel Collectionimplements the PHP ArrayAccessinterface (which is why using foreachis possible in the first place).

LaravelCollection实现了 PHPArrayAccess接口（这就是为什么foreach首先可以使用）。

If you have the key already you can just use PHP unset.

如果您已经拥有密钥，则可以使用 PHP unset。

I prefer this, because it clearly modifies the collection in place, and is easy to remember.

我更喜欢这个，因为它清楚地修改了集合，并且很容易记住。

foreach ($collection as $key => $value) {
    unset($collection[$key]);
}

回答by algorhythm

I assumed that $collection->selectedmeans $value->selectedand then I would refactor the complete code like this:

我认为这$collection->selected意味着$value->selected然后我会像这样重构完整的代码：

/**
 * Filter all `selected` items
 *
 * @link https://laravel.com/docs/5.8/collections#method-filter
 */
$selected = $collection->filter(function($value, $key) {
    return $value->selected;
})->toArray();

回答by Kaushik shrimali

If you know the key which you unset then put directly by comma separated

如果您知道未设置的密钥，则直接用逗号分隔

unset($attr['placeholder'], $attr['autocomplete']);