# collapse方法
将多个数组合并成一个。
```
$collection = collect([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);
$collapsed = $collection->collapse();
$collapsed->all(); // [1, 2, 3, 4, 5, 6, 7, 8, 9]
```
- 介绍
- Laravel5发送邮件使用Service隔离业务
- 如何使用Repository模式
- 如何使用Service模式
- 如何使用Presenter模式
- Laravel 5.* 执行迁移文件报错：Specified key was too long error
- EloquentORM关联关系
- EloquentORM关联关系之一对一
- EloquentORM关联关系之一对多
- EloquentORM关联关系之远层一对多
- EloquentORM关联关系之多对多
- EloquentORM关联关系之多态关联
- EloquentORM关联关系之多对多多态关联
- Laravel测试
- Laravel中涉及认证跳转地址的修改的地方
- Laravel中Collection的基本使用
- all
- avg
- chuck
- collapse
- combine
- contains
- containsStrict
- count
- diff
- diffAssoc
- diffKeys
- each
- every
- except
- filter
- first
- flatMap
- flatten
- flip
- forget
- forPage
- get
- groupBy
- has
- implode
- intersect
- intersectKey
- isEmpty
- isNotEmpty
- keyBy
- keys
- last
- map
- mapWithKeys
- max
- median
- merge
- min
- mode
- nth
- only
- partition
- pipe
- pluck
- pop
- prepend
- pull
- push
- put
- random
- reduce
- reject
- reverse
- search
- shift
- shuffle
- slice
- sort
- sortBy
- sortByDesc
- splice
- split
- sum
- take
- tap
- times
- toArray
- toJson
- transform
- union
- unique
- uniqueStrict
- values
- when
- where
- whereStrict
- whereIn
- whereInStrict
- whereNotIn
- whereNotInStrict
- zip
- Laravel中Collection的实际使用
- collection中sum求和
- collection格式化计算数据
- collection格式化计算数据计算github事件得分总和
- collection格式化markdown数据列表
- collection格式化计算两个数组的数据
- collection中reduce创建lookup数组
- TODO