PHP array 分割是由于需要將數(shù)組中的元素進行分組而產(chǎn)生的技術(shù)需求。通過分割數(shù)組，可以將大數(shù)組分解成多個小數(shù)組，以方便在程序中進行操作，同時也增強了程序的可讀性、可維護性和可擴展性。

下面假設(shè)有一個存儲用戶信息的數(shù)組 $users ，其中每個元素都有 name、age 兩個屬性。現(xiàn)在需將 $users 進行分割，每個小組包含不超過 5 名用戶，以便對每個小組進行操作。

$users = [
["name" =>"Tom", "age" =>20],
["name" =>"Mary", "age" =>18],
["name" =>"Joe", "age" =>19],
["name" =>"Nancy", "age" =>21],
["name" =>"Peter", "age" =>22],
["name" =>"Lucy", "age" =>18],
["name" =>"David", "age" =>20],
["name" =>"Olivia", "age" =>21],
["name" =>"Frank", "age" =>19],
["name" =>"Cindy", "age" =>22],
];

基于上述需求，可以使用 array_chunk() 函數(shù)將 $users 分割成多個小數(shù)組：

$grouped_users = array_chunk($users, 5);

這樣，$grouped_users 就變?yōu)榱艘粋€二維數(shù)組，其中每個小數(shù)組最多包含 5 個元素：

[
[
["name" =>"Tom", "age" =>20],
["name" =>"Mary", "age" =>18],
["name" =>"Joe", "age" =>19],
["name" =>"Nancy", "age" =>21],
["name" =>"Peter", "age" =>22],
],
[
["name" =>"Lucy", "age" =>18],
["name" =>"David", "age" =>20],
["name" =>"Olivia", "age" =>21],
["name" =>"Frank", "age" =>19],
["name" =>"Cindy", "age" =>22],
]
]

如果將 $grouped_users 中的每個小數(shù)組打印出來，會得到類似以下的結(jié)果：

Array
(
[0] =>Array
(
[0] =>Array
(
[name] =>Tom
[age] =>20
)
[1] =>Array
(
[name] =>Mary
[age] =>18
)
[2] =>Array
(
[name] =>Joe
[age] =>19
)
[3] =>Array
(
[name] =>Nancy
[age] =>21
)
[4] =>Array
(
[name] =>Peter
[age] =>22
)
)
[1] =>Array
(
[0] =>Array
(
[name] =>Lucy
[age] =>18
)
[1] =>Array
(
[name] =>David
[age] =>20
)
[2] =>Array
(
[name] =>Olivia
[age] =>21
)
[3] =>Array
(
[name] =>Frank
[age] =>19
)
[4] =>Array
(
[name] =>Cindy
[age] =>22
)
)
)

通過上述實例，可以看到 array_chunk() 的使用方式：將需要分割的數(shù)組作為第一個參數(shù)，指定每個小組最多包含的元素數(shù)量作為第二個參數(shù)（即本例中的 5），即可得到分割后的結(jié)果。

除了 array_chunk() 函數(shù)，PHP 還提供了其他分割數(shù)組的方法，例如 array_slice()、array_splice()、array_pad() 等。這些方法各有特點，根據(jù)實際需求選擇合適的方法，可以提高代碼的效率和可讀性。

總之，PHP array 分割是一項非常有用的技術(shù)，可以讓程序更加靈活、高效，也是每個 PHP 開發(fā)者必須掌握的基礎(chǔ)知識之一。