How to merge one-dimensional array into two-dimensional array in php

During the development process, we often encounter situations where we need to convert a one-dimensional array into a two-dimensional array. This problem is easily solved in PHP. This article will introduce two methods to merge one-dimensional arrays into two-dimensional arrays.

Method 1: Use the array_chunk function

The array_chunk function can split an array into multiple arrays, where the number of elements in each array can be specified. The syntax of this function is as follows:

array array_chunk(array $array, int $size, bool $preserve_keys = false)

Among them, $array is the array to be split, $size is the number of elements in each array, and $preserve_keys indicates whether to retain the key names of the original array.

The sample code is as follows:

$array = array('cat', 'dog', 'fish', 'bird', 'hamster', 'rabbit');
$result = array_chunk($array, 2);
print_r($result);

This code will output the following results:

Array
(
    [0] => Array
        (
            [0] => cat
            [1] => dog
        )

    [1] => Array
        (
            [0] => fish
            [1] => bird
        )

    [2] => Array
        (
            [0] => hamster
            [1] => rabbit
        )

)

The above code divides the original array into three arrays, with two in each array element.

Next, we can use a foreach loop to iterate through the elements in each two-dimensional array and merge them into one two-dimensional array.

The sample code is as follows:

$array = array('cat', 'dog', 'fish', 'bird', 'hamster', 'rabbit');
$result = array_chunk($array, 2);
$new_array = array();
foreach ($result as $res) {
    $new_array[] = $res;
}
print_r($new_array);

The above code will output the following results:

Array
(
    [0] => Array
        (
            [0] => cat
            [1] => dog
        )

    [1] => Array
        (
            [0] => fish
            [1] => bird
        )

    [2] => Array
        (
            [0] => hamster
            [1] => rabbit
        )

)

Now, we have successfully merged the one-dimensional array into a two-dimensional array.

Method 2: Use for loop

Using for loop can also merge one-dimensional arrays into two-dimensional arrays. This method is relatively straightforward.

The sample code is as follows:

$array = array('cat', 'dog', 'fish', 'bird', 'hamster', 'rabbit');
$new_array = array();
for ($i = 0; $i < count($array); $i += 2) {
    $new_array[] = array($array[$i], $array[$i + 1]);
}
print_r($new_array);

The above code will output the following results:

Array
(
    [0] => Array
        (
            [0] => cat
            [1] => dog
        )

    [1] => Array
        (
            [0] => fish
            [1] => bird
        )

    [2] => Array
        (
            [0] => hamster
            [1] => rabbit
        )

)

The above code uses a for loop to split the original one-dimensional array into multiple pieces containing two A two-dimensional array of elements.

Summary

The above are two methods of merging one-dimensional arrays into two-dimensional arrays. The array_chunk function can split an array into multiple arrays. The number of elements in each array can be specified. It is more straightforward to use a for loop. I hope this article can be helpful to readers who are learning PHP.

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