php array calculation sum

In PHP, array is a very commonly used data structure. It can store any type of data and can be manipulated in various ways. Among them, array calculation and summation is also a very common operation. This article will discuss how to calculate the sum of elements in an array using PHP.

1. Use a for loop to calculate the sum of array elements

A simple way is to use a for loop to traverse the array and add the current element to the variable that calculates the sum in each iteration . For example:

$arr = array(1, 2, 3, 4, 5);
$sum = 0;
for ($i = 0; $i < count($arr); $i++) {
    $sum += $arr[$i];
}
echo "数组元素的和为：".$sum;

In the above example, we first define an array containing five integers and save it in the variable $arr. Then, we define a variable $sum and initialize it to 0. Next, we use a for loop to iterate through each element in the array and add it to the $sum variable on each iteration. Finally, we use the echo statement to output the results.

2. Use foreach loop to calculate the sum of array elements

In addition to using for loop to traverse the array, we can also use foreach loop to achieve the same function. The foreach loop can traverse the array more concisely, while also providing easy access to keys and values. For example:

$arr = array(1, 2, 3, 4, 5);
$sum = 0;
foreach ($arr as $value) {
    $sum += $value;
}
echo "数组元素的和为：".$sum;

In the above example, we use a foreach loop to traverse the array and add the current element to the variable $sum in each iteration. Unlike a for loop, a foreach loop provides an easier way to iterate over an array.

3. Use the array_sum function to calculate the sum of array elements

In addition to manually traversing the array and calculating the sum, PHP also provides a built-in array_sum function that can calculate the array in a single function call The sum of the elements. This function accepts an array as argument and returns the sum of all elements. For example:

$arr = array(1, 2, 3, 4, 5);
$sum = array_sum($arr);
echo "数组元素的和为：".$sum;

In the above example, we first define an array containing five integers and save it in the variable $arr. We then use the array_sum function to calculate the sum of the array elements and save the result in the variable $sum. Finally, we use the echo statement to output the results.

Summary: The above three methods can all calculate the sum of array elements. Using a for loop is most common and can also access the keys and values ​​of an array. Using a foreach loop is more concise and allows easy access to the values ​​of the array. Using the array_sum function is the simplest and most direct, suitable for common calculation and summing operations. Regardless of which method you use, you can easily calculate the sum of array elements.

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