php一个数组分割成多个数组array_chunk

php中可以用array_chunk将一个数组分隔成若干个数组。

数组

$array = ['name' => 'tom', 'age' => 20, 3, 4, 5, 'a', 'b'];

每3个分割一组

$chunk_result = array_chunk($array, 3);

结果

Array
(
    [0] => Array
        (
            [0] => tom
            [1] => 20
            [2] => 3
        )

    [1] => Array
        (
            [0] => 4
            [1] => 5
            [2] => a
        )

    [2] => Array
        (
            [0] => b
        )

)

如果数量不足，则最后一个数组不一定为3个

如果需要保留键值，可以设置第三个参数为true

$chunk_result = array_chunk($array, 3, true);

结果

Array
(
    [0] => Array
        (
            [name] => tom
            [age] => 20
            [0] => 3
        )

    [1] => Array
        (
            [1] => 4
            [2] => 5
            [3] => a
        )

    [2] => Array
        (
            [4] => b
        )

)

心得

使用array_chunk比较的坑在于：如果数组过大，array_chunk很可能造成内存溢出，报：Allowed memory size of 134217728 bytes exhausted 类似这样的错误。