在 php 中不使用 explode 将字符串转换为数组

Question

我想将字符串保存为 mongoDB 数据库中的数组。 我得到以下字符串，我需要将其转换为数组以将数据存储在 mongoDB 数据库中。
我正在使用 codeigniter 框架。

输入字符串

"[ [ 18, 18, 18, 18, 18, 18, 18, 18, 18 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ] ]"

期望的输出

[ 
    [ 
        18, 
        18, 
        18, 
        18, 
        18, 
        18, 
        18, 
        18, 
        18
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ], 
    [ 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2, 
        2
    ]

提前致谢。

Answer 1

That looks like JSON, so why not use a JSON parser?

It's a string so it's not work, i try that.

确实是一个JSON字符串，与你的说法相反:)

<?php

print_r( json_decode("[ [ 18, 18, 18, 18, 18, 18, 18, 18, 18 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ], [ 2, 2, 2, 2, 2, 2, 2, 2, 2 ] ]"));

Fiddle

输出

Array
(
    [0] => Array
        (
            [0] => 18
            [1] => 18
            [2] => 18
            [3] => 18
            [4] => 18
            [5] => 18
            [6] => 18
            [7] => 18
            [8] => 18
        )

    [1] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [2] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [3] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [4] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [5] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [6] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [7] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

    [8] => Array
        (
            [0] => 2
            [1] => 2
            [2] => 2
            [3] => 2
            [4] => 2
            [5] => 2
            [6] => 2
            [7] => 2
            [8] => 2
        )

)