How to find the sum of array key values ​​in php

In PHP, array is a very commonly used data type, which can easily manage and store large amounts of data. In an array, each element has a key and a value, where the key is used to uniquely identify the element and the value stores the information about the element.

When we need to sum the values ​​of certain elements in an array, we can use the loop structure in PHP to traverse the elements in the array one by one, accumulate their values, and save the result to a variable. . However, this method is not efficient and the code is cumbersome.

PHP provides a more efficient and convenient way to find the sum of array key values: the array_sum() function. This function calculates the sum of all numeric key values ​​in an array and returns the result. The following is the basic syntax of the function:

array_sum(array $array): float|int

array_sum() The function receives an array as a parameter and returns the sum of the values ​​of all its numeric elements. If there are non-numeric elements in the parameter array, they will be ignored and will not be included in the calculation.

The following is an example that demonstrates how to use the array_sum() function to find the sum of PHP array key values:

<?php

$numbers = array(1, 2, 3, 4, 5);
$sum = array_sum($numbers);
echo $sum; // 输出 15

?>

In the above example, we define an array named $numbers , the array contains 5 numeric elements. We then pass the array into the array_sum() function and save the return result into a variable called $sum. Finally, we output the variable $sum through the echo statement, and we can see that the output result is 15, which is the sum of all elements in the input array.

Of course, in actual development, we need to select the elements to be summed from the array according to actual needs instead of passing the entire array into the array_sum() function. For example, we can use PHP's array slicing to select specified elements in the array, and then pass them into the array_sum() function for summation. Here is an example that demonstrates how to use array slicing to select array elements and find their sum:

<?php

$numbers = array(1, 2, 3, 4, 5);
$slice = array_slice($numbers, 0, 3); // 选择前三个元素
$sum = array_sum($slice);
echo $sum; // 输出 6

?>

In the above example, we used the array_slice() function to select the first 3 elements of the array $numbers element and save the slice result into a variable named $slice. We then pass the $slice array into the array_sum() function and save the result into a variable called $sum. Finally, we output the variable $sum through the echo statement, and we can see that the output result is 6, which is the sum of the first three elements in the array $numbers.

In addition to the array_sum() function, there are many other array operation functions in PHP that can help us operate and manage arrays more efficiently. Mastering these functions can not only improve our development efficiency, but also make our code more robust and elegant.

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