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PHP array_chunk() 函数可以将一个数组分割成多个，其语法如下：
array array_chunk ( array $arr,int $size [,bool $preserve_keys = false ] )
参数说明：
-
arr 表示要分割的数组；
-
size 表示分割后的子数组的元素个数；
-
preserve_keys 表示是否保留 arr 数组中原有的键名，默认为 false，也就是不保留，分割后的每个子数组将使用从 0 开始的新的数字索引；如果设置为 true，那就保留 arr 中原有的键名。
array_chunk() 会将 arr 数组分割成多个子数组，每个子数组的元素个数由 size 决定。最后一个子数组的元素个数可能会少于 size 个。
返回值：返回一个由分割后的子数组构成的多维数组。
使用示例如下：
<?php
$arr1 = array("C语言中文网","PHP教程","http://c.biancheng.net/php/","Java教程","http://c.biancheng.net/java/","Python教程","http://c.biancheng.net/python/");
print_r( array_chunk($arr1,3) ); //不保留原有键名
print_r( array_chunk($arr1,3,true) ); //保留原有键名
$arr2 = array( 'fruits'=>array('Apple','banana','pear','orange'),'animal','vehicle','architecture','food');
print_r( array_chunk($arr2,3) );
print_r( array_chunk($arr2,true) );
?>
执行以上程序的输出结果如下：
Array
(
??? [0] => Array
??? (
??????? [0] => C语言中文网
??????? [1] => PHP教程
??????? [2] => http://c.biancheng.net/php/
??? )
??? [1] => Array
??? (
??????? [0] => Java教程
??????? [1] => http://c.biancheng.net/java/
??????? [2] => Python教程
??? )
??? [2] => Array
??? (
??????? [0] => http://c.biancheng.net/python/
??? )
)
Array
(
??? [0] => Array
??? (
??????? [0] => C语言中文网
??????? [1] => PHP教程
??????? [2] => http://c.biancheng.net/php/
??? )
??? [1] => Array
??? (
??????? [3] => Java教程
??????? [4] => http://c.biancheng.net/java/
??????? [5] => Python教程
??? )
??? [2] => Array
??? (
??????? [6] => http://c.biancheng.net/python/
??? )
)
Array
(
??? [0] => Array
??? (
??????? [0] => Array
??????? (
??????????? [0] => Apple
??????????? [1] => banana
??????????? [2] => pear
??????????? [3] => orange
??????? )
??????? [1] => animal
??????? [2] => vehicle
??? )
??? [1] => Array
??? (
??????? [0] => architecture
??????? [1] => food
??? )
)
Array
(
??? [0] => Array
??? (
??????? [fruits] => Array
??????? (
??????????? [0] => Apple
??????????? [1] => banana
??????????? [2] => pear
??????????? [3] => orange
??????? )
??????? [0] => animal
??????? [1] => vehicle
??? )
??? [1] => Array
??? (
??????? [2] => architecture
??????? [3] => food
??? )
) （编辑：李大同）
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