How to divide two arrays in php

In web development, we often need to perform calculations on some arrays. One of the common operations is to divide two arrays. This article will introduce how to implement the division operation of two arrays in PHP.

In PHP, we can construct an array by using the key name of the array as the index and the key value of the array as the element. For example, the following is an array used to store sales data:

$sales = [
    "John" => 50,
    "Mary" => 30,
    "Peter" => 20,
];

The above array indicates that John sold 50 items, Mary sold 30 items, and Peter sold 20 items.

Suppose we want to calculate the proportion of sales of these salespersons to total sales. We need to first calculate the total sales, and then calculate the proportion of sales of each salesperson separately.

First, we can use the array_sum() function to calculate the sum of all elements in the array to get the total sales. The code is as follows:

$total_sales = array_sum($sales);

Next, we can use the array_map() function to process the sales of each salesperson and divide it by the total sales to get each salesperson proportion of sales. The code is as follows:

$sales_percentage = array_map(function($sales) use($total_sales) {
    return $sales / $total_sales;
}, $sales);

The above code uses an anonymous function that receives the sales volume of each salesperson as a parameter and divides it by the total sales to obtain the sales ratio. Use the use keyword to make the anonymous function use the external variable $total_sales.

Finally, we can use the array_combine() function to combine the two arrays to get the final result. The code is as follows:

$result = array_combine(array_keys($sales), $sales_percentage);

The above code uses the array_keys() function to obtain all the key names of the $sales array and pass it as the first parameter to array_combine() function, uses the calculated proportion of sales as the second parameter. This function combines key names and key values ​​into an associative array, which is the final result array.

The complete code is as follows:

$sales = [
    "John" => 50,
    "Mary" => 30,
    "Peter" => 20,
];
$total_sales = array_sum($sales);
$sales_percentage = array_map(function($sales) use($total_sales) {
    return $sales / $total_sales;
}, $sales);
$result = array_combine(array_keys($sales), $sales_percentage);
print_r($result);

The output result is:

Array
(
    [John] => 0.5
    [Mary] => 0.3
    [Peter] => 0.2
)

The above results indicate that John’s sales account for 50% of the total sales, and Mary’s sales account for 50% of the total sales. 30% of sales, Peter's sales accounted for 20% of total sales.

In actual development, we may need to perform division operations on more complex arrays, such as multi-dimensional arrays or arrays of different lengths. In this case, we can use loops or recursion to implement the division operation.

In short, PHP provides a wealth of functions and language features that can easily implement various operations on arrays, including division operations. I believe that by studying this article, you have mastered the methods and techniques of dividing PHP arrays.

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