我可以将这种格式的数组拆分成这个吗？

Question

How can I do the below change in PHP?

Input:

[hiddenAllPrefered] => Array
(
    [0] => 14477,14478,14479,14485,14486,14487
)

Output should be like this:

[hiddenAllPrefered] => Array
(
    [0] => 14477,14478,14479
    [1] => 14485,14486,14487
)

Answer 1

A possible solution:

$input = array('14477,14478,14479,14485,14486,14487');

$output = array_map(
    function (array $a){
        return implode(',', $a);
    },
    array_chunk(
        explode(',', $input[0]),
        3
    )
);

Read it from inside out:

• explode() splits the string $input[0] using comma (,) as delimiter and returns an array;
• array_chunk() splits the array into chunks of size 3; it returns an array of arrays, each inner array contains 3 elements (apart from the last one that can contain less);
• array_map() applies the function it receives as its first argument to each value of the array it gets as its second argument (the array of arrays returned by array_chunk()); it returns an array whose values are the values returned by the function;
• the anonymous function passed to array_map() gets an array (of size 3 or less) and uses implode() to join its elements into a string, using comma (,) to separate the values and returns the string;
• array_map() puts together all the values returned by the anonymous function (one for each chunk of 3 elements of the array) into a new array it returns.

The output (print_r($output)) looks like this:

Array
(
    [0] => 14477,14478,14479
    [1] => 14485,14486,14487
)