How to loop output array and sum in php

PHP is a server-side scripting language widely used in web development. It can be combined with HTML to generate dynamic web pages, and can also read and output data. PHP has a very rich function library, including various commonly used arithmetic functions, such as the sum() function, which can be used to calculate the sum of array elements.

In this article, we will discuss how to loop through an array and sum it using PHP. We will explore this problem from the following aspects: how to create an array, how to loop through the array, and how to calculate the sum of the array using the sum() function.

1. Create an array

In PHP, you can use the array keyword to create an array. The syntax is as follows:

$array_name = array(value1, value2, value3, ...);

Among them, $array_name is the name of the array variable, value1, value2, etc. represent the element values ​​in the array, which can be numbers or strings in the array. For example, the following code shows the creation of an array containing 5 integers:

$numbers = array(10, 20, 30, 40, 50);

2. Looping through the array

Traversing the array means accessing each element in the array sequentially through a loop. In PHP, commonly used loop statements include for, while, do-while, etc. The following code uses a for loop to traverse the $numbers array above and output the value of each element to the screen:

for($i = 0; $i < count($numbers); $i++) {
    echo "$numbers[$i] ";
}

In this code, the count() function is used to calculate the length of the array, and the loop The variable $i increases one by one from 0 until the length of the array, and then accesses the element value in the array through [$i].

3. Array summation

In PHP, you can use the sum() function to calculate the sum of array elements. The sum() function is used as follows:

$sum = array_sum($array_name);

Among them, $array_name is the array that needs to be calculated. For example, the following code shows how to use the sum() function to calculate the sum of all elements in the $numbers array:

$sum = array_sum($numbers);
echo "数组元素的和为：" . $sum;

The complete code is as follows:

$numbers = array(10, 20, 30, 40, 50);

for($i = 0; $i < count($numbers); $i++) {
    echo "$numbers[$i] ";
}

$sum = array_sum($numbers);
echo "数组元素的和为：" . $sum;

Through the study of this article, we Know how to create an array in PHP, use a loop to traverse an array, and use the sum() function to calculate the sum of array elements. This is one of the most basic operations in PHP. When writing PHP programs, we often need to operate on arrays. Traversing and calculating the sum of array elements is one of the most common operations.

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