How to add a number to an array in php

During the development process, we often need to operate arrays, and sometimes we need to add one or more values ​​to the array. Let's introduce how to add a number to an array in PHP.

In PHP, arrays are variables used to store multiple data values. Array elements can contain any type of data, including numbers, strings, objects, etc. PHP provides some built-in functions to operate on arrays, and we can use these functions to add a number to the array.

How to add an array

There are many ways to add an element to an array in PHP. Let’s introduce each one below.

1. Using array index

In PHP, you can use the index of the array to add an element. As shown below:

$numbers = array(1, 2, 3, 4, 5);
$numbers[5] = 6;

The above code adds the number 6 to the array $numbers at index 5. You can use the print_r() function to view the contents of the array:

print_r($numbers);

The output is as follows:

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

2. Use the array_push() function

The array_push() function in PHP is used Push one or more elements to the end of the array. The syntax is as follows:

array_push($array, $value1, $value2, ...);

Among them, $array is the array to which elements are to be added, $value is the value to be added, and multiple values ​​can be added.

For example, add the number 6 to the end of the array $numbers:

$numbers = array(1, 2, 3, 4, 5);
array_push($numbers, 6);

You can also use the print_r() function to view the contents of the array:

print_r($numbers);

The output is as follows:

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

3. Use the [] assignment operator

After PHP 5.4 version, we can use the [] assignment operator to add elements to the array. For example, add the number 6 to the array $numbers:

$numbers = array(1, 2, 3, 4, 5);
$numbers[] = 6;

You can also use the print_r() function to view the contents of the array:

print_r($numbers);

The output is as follows:

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

Summary

There are many ways to add elements to an array in PHP, including using array index, array_push() function and [] assignment operator. All of the methods provided above can add a number to an array.

It should be noted that when adding elements using array index, if the specified index already exists, the original value will be overwritten. When adding elements using the array_push() function and the [] assignment operator, the new value will be added after the original array element.

In actual development, choose the appropriate method to add elements to the array according to specific needs.

The above is the detailed content of How to add a number to an array in php. For more information, please follow other related articles on the PHP Chinese website!