How to add two-dimensional array elements in php

Two-dimensional array is a nested data structure, which consists of multiple one-dimensional arrays. In PHP, adding two-dimensional array elements requires using one or more array functions. This article will introduce how to add two-dimensional array elements.

1. Use the array_push function

The array_push function is a function provided by PHP that adds elements to the end of an array. You can use it to add new elements to a two-dimensional array. The specific method is as follows:

<?php
$fruits = array(
    array("apple", 50),
    array("banana", 30),
    array("orange", 20),
);

$fruits_new = array("grape", 40);

array_push($fruits, $fruits_new);

print_r($fruits);
?>

In the above code, we first define a two-dimensional array $fruits, which contains three one-dimensional arrays, each one-dimensional array contains the name and price of the fruit. We then define the new element we want to add as a one-dimensional array $fruits_new and use the array_push function to add it to the end of the $fruits array. Finally, use the print_r function to output the $fruits array.

The output result is as follows:

Array
(
    [0] => Array
        (
            [0] => apple
            [1] => 50
        )

    [1] => Array
        (
            [0] => banana
            [1] => 30
        )

    [2] => Array
        (
            [0] => orange
            [1] => 20
        )

    [3] => Array
        (
            [0] => grape
            [1] => 40
        )

)

You can see that the new element has been successfully added to the two-dimensional array.

2. Direct assignment

We can also directly assign new elements to the two-dimensional array. The specific method is as follows:

<?php
$fruits = array(
    array("apple", 50),
    array("banana", 30),
    array("orange", 20),
);

$fruits[] = array("grape", 40);

print_r($fruits);
?>

In the above code, We define the new element we want to add as a one-dimensional array and add it to the end of the $fruits array using the [] operator. Finally, use the print_r function to output the $fruits array.

The output result is the same as the above example, and the new element has also been successfully added to the two-dimensional array.

3. Use the array_merge function

The array_merge function is a function provided by PHP to merge multiple arrays into one array. You can also use it to merge an array with one or more elements into a new array. The specific method is as follows:

<?php
$fruits = array(
    array("apple", 50),
    array("banana", 30),
    array("orange", 20),
);

$fruits_new = array(array("grape", 40));

$fruits_merged = array_merge($fruits, $fruits_new);

print_r($fruits_merged);
?>

In the above code, we define the new element to be added as a two-dimensional array $fruits_new, and use the array_merge function to merge it into the $fruits array. Finally, use the print_r function to output the $fruits_merged array.

The output result is also the same as the above example, and the new element has also been successfully added to the two-dimensional array.

Summary

The above are three methods of adding new elements to a two-dimensional array, namely using the array_push function, direct assignment and using the array_merge function. In actual development, just choose the appropriate method according to specific needs.

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