How to store numbers into an array in php

PHP is a commonly used programming language that provides many data types and data structures, including arrays. An array is a data structure that stores a set of data in a variable, the elements of which can be accessed by index or key value. In PHP, storing numbers into an array is very simple. This article will introduce how to store numbers into an array.

1. Create an array

In PHP, you can use the keyword array or the square bracket method [] to create an array. The following are examples of the two methods:

Using array:

$nums = array(1, 2, 3, 4);

Using square brackets:

$nums = [1, 2, 3, 4];

Both of the above methods create an array containing four elements, The values ​​of each element are 1, 2, 3 and 4.

2. Store numbers in arrays

In PHP, you can use the assignment operator = to store numbers in arrays. The following is an example of storing a number into an array:

$nums = [];  // 创建一个空数组
$nums[0] = 1; // 将数1存入数组中

In the above example, an empty array $nums is first created, and then the number 1 is stored in the array using subscript 0. Now, the array $nums contains an element whose value is 1.

If you want to add multiple elements to an array, you can use a foreach loop to iterate through a set of numbers and store each number in the array. The following is an example of storing multiple numbers into an array:

$nums = [];  // 创建一个空数组
foreach ([1, 2, 3, 4] as $num) {  // 迭代一组数
    $nums[] = $num;  // 将每个数存入数组中
}

In the above example, an empty array $nums is first created, and then a foreach loop is used to iterate a set of numbers [1, 2, 3, 4 ]. In the loop, store each number into the array $nums. Now, the array $nums contains four elements, each with the values ​​1, 2, 3, and 4.

In addition, you can also use the array function array_push() to add numbers to the end of the array. The following is an example of adding numbers to the end of an array:

$nums = [1, 2];  // 创建一个包含两个元素的数组
array_push($nums, 3, 4);  // 将数3和4添加到数组末尾

In the above example, an array $nums containing two elements is first created, and then the numbers 3 and 4 are added using the array function array_push() to the end of array $nums. Now, the array $nums contains four elements, each with the values ​​1, 2, 3, and 4.

3. Access elements in an array

In PHP, you can use subscripts or key values ​​to access elements in an array. The following are examples of both ways:

Use subscripts:

$nums = [1, 2, 3, 4];  // 创建一个包含四个元素的数组
echo $nums[2];  // 输出数组$nums中下标为2的元素，即数3

Use key values:

$nums = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4];  // 创建一个关联数组
echo $nums['c'];  // 输出数组$nums中键值为'c'的元素，即数3

In the above example, use subscripts and key values ​​to access respectively The elements in the array $nums. Array subscripts start from 0 and increase to the subscript value of the last element of the array. In an associative array containing key values, the subscripts are replaced by key values, allowing for more flexible and convenient access to the elements in the array.

4. Summary

This article introduces how to store numbers into an array. In PHP, you can use the keyword array or the bracket method [] to create an array. You can use the assignment operator = to store a number into an array, or you can use the array function array_push() to add a number to the end of the array. You can use subscripts or key values ​​to access elements in the array. The subscripts increase from 0, and key values ​​can access elements in the array more flexibly and conveniently.

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