What is the summation function of a certain field in a php array?

In PHP, arrays are a very common data structure. Developers can easily operate on array data, such as filtering, sorting, merging, etc. Summing a field in an array is also common in development. needs.

The following is a simple method that can quickly implement the sum operation of a field in an array in PHP.

1. First, create an array for testing, which contains multiple associative arrays. Each associative array contains two fields: 'name' and 'value'.

$testArray = array(
  array('name' => 'apple', 'value' => 10),
  array('name' => 'orange', 'value' => 20),
  array('name' => 'banana', 'value' => 30),
  array('name' => 'watermelon', 'value' => 40),
  array('name' => 'melon', 'value' => 50)
);

2. Next, we can use the array_sum() function in PHP to sum the values ​​of a field in the array. In this example, we need to sum the values ​​of the 'value' field in the array.

$sum = array_sum(array_column($testArray, 'value'));

In the above code, we first use the array_column() function to extract the value of the 'value' field from the $testArray array, and then use the array_sum() function to sum it, and finally get The result is $sum.

3. Finally, we can output the summed value and the contents of the original array for comparison.

echo '求和结果为：' . $sum . '<br>';
echo '原始数组内容为：<br>';
print_r($testArray);

The complete code is as follows:

$testArray = array(
  array('name' => 'apple', 'value' => 10),
  array('name' => 'orange', 'value' => 20),
  array('name' => 'banana', 'value' => 30),
  array('name' => 'watermelon', 'value' => 40),
  array('name' => 'melon', 'value' => 50)
);

$sum = array_sum(array_column($testArray, 'value'));

echo '求和结果为：' . $sum . '<br>';
echo '原始数组内容为：<br>';
print_r($testArray);

The execution result is:

The summation result is: 150
The original array content is:
Array
(

[0] => Array
    (
        [name] => apple
        [value] => 10
    )

[1] => Array
    (
        [name] => orange
        [value] => 20
    )

[2] => Array
    (
        [name] => banana
        [value] => 30
    )

[3] => Array
    (
        [name] => watermelon
        [value] => 40
    )

[4] => Array
    (
        [name] => melon
        [value] => 50
    )

)

As you can see, we have successfully summed the values ​​of the 'value' field in the array, and the result is 150. This method is simple and easy to understand, and is suitable for situations where the amount of data is small. For large-scale data, it may be necessary to use other algorithms with better performance for summation operations.

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