Laravel 8 可用方法
接下来，我们将讨论每个 Collection 类可用的方法。记住，所有这些方法都可以链式调用以流畅地操作底层数组。此外，几乎所有方法都返回一个新的 Collection 实例，允许你在需要时保存集合的原始副本：
all
average
avg
chunk
chunkWhile
collapse
collect
combine
concat
contains
containsStrict
count
countBy
crossJoin
dd
diff
diffAssoc
diffKeys
dump
duplicates
duplicatesStrict
each
eachSpread
every
except
filter
first
firstWhere
flatMap
flatten
flip
forget
forPage
get
groupBy
has
implode
intersect
intersectByKeys
isEmpty
isNotEmpty
join
keyBy
keys
last
macro
make
map
mapInto
mapSpread
mapToGroups
mapWithKeys
max
median
merge
mergeRecursive
min
mode
nth
only
pad
partition
pipe
pipeInto
pluck
pop
prepend
pull
push
put
random
reduce
reject
replace
replaceRecursive
reverse
search
shift
shuffle
skip
skipUntil
skipWhile
slice
some
sort
sortBy
sortByDesc
sortDesc
sortKeys
sortKeysDesc
splice
split
splitIn
sum
take
takeUntil
takeWhile
tap
times
toArray
toJson
transform
union
unique
uniqueStrict
unless
unlessEmpty
unlessNotEmpty
unwrap
values
when
whenEmpty
whenNotEmpty
where
whereStrict
whereBetween
whereIn
whereInStrict
whereInstanceOf
whereNotBetween
whereNotIn
whereNotInStrict
whereNotNull
whereNull
wrap
zip