How to create a multidimensional array in php and assign values

In PHP programming, multidimensional arrays are often used. If we need to add some new elements to a multidimensional array, we need to know how to add a multidimensional array. This article will introduce how to add multidimensional arrays in PHP.

1. What is a multidimensional array

In PHP, a multidimensional array refers to an array composed of multiple arrays. Each array can contain multiple keys and corresponding values. Multidimensional arrays can be like a tree, consisting of multiple branches and leaves, and each branch can have its own branches and leaves.

2. Create a multidimensional array

In PHP, you can create a multidimensional array in the following ways:

$multidimensional_array = array(
    array("apple", "orange", "banana"),
    array("carrot", "spinach", "tomato"),
    array("chicken", "beef", "pork")
);

The above code creates a three-dimensional array, in which each array Both contain three elements. The first dimension array contains three arrays, each containing three elements.

3. Adding multi-dimensional arrays

In PHP, you can use the following methods to add elements in multi-dimensional arrays:

1. Add elements directly

$multidimensional_array[0][3] = "pear";

The above code adds the element "pear" to the first subarray of the first dimension array.

2. Use the array_push() function

array_push($multidimensional_array[1], "lettuce");

The above code adds the element "lettuce" to the end of the second-dimensional array.

3. Use [] assignment syntax

$multidimensional_array[2][] = "fish";

The above code adds the element "fish" to the end of the third-dimensional array.

4. Example demonstration

The following is a complete PHP program that demonstrates how to add elements to a multi-dimensional array:

<?php
$multidimensional_array = array(
    array("apple", "orange", "banana"),
    array("carrot", "spinach", "tomato"),
    array("chicken", "beef", "pork")
);

$multidimensional_array[0][3] = "pear";

array_push($multidimensional_array[1], "lettuce");

$multidimensional_array[2][] = "fish";

print_r($multidimensional_array);
?>

Output result:

Array
(
    [0] => Array
        (
            [0] => apple
            [1] => orange
            [2] => banana
            [3] => pear
        )

    [1] => Array
        (
            [0] => carrot
            [1] => spinach
            [2] => tomato
            [3] => lettuce
        )

    [2] => Array
        (
            [0] => chicken
            [1] => beef
            [2] => pork
            [3] => fish
        )

)

As you can see from the above results, we have successfully added new elements to the multi-dimensional array.

5. Summary

In PHP programming, multidimensional arrays are a very common data type. To be able to better handle this type of data, we need to understand how to add multidimensional arrays. Through the introduction of this article, I believe that readers already have a certain understanding of how to add multi-dimensional arrays. In actual programming, we can choose different ways to add elements to multi-dimensional arrays according to specific needs.

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