What is the php array column sum function

PHP is a scripting language with a wide range of applications, especially in the field of web development. An important feature of PHP is that it is very flexible. It has many built-in functions to facilitate developers to program. Among them, the array column sum function is a very practical function in PHP.

Array is a common data type in PHP. It can accommodate any type of data, such as strings, values, Boolean, etc. An array is composed of multiple key-value pairs, where each key-value pair represents an element in the array. When we need to calculate values ​​in an array, we usually need to use the array column sum function.

The array column summation function in PHP is implemented by the array_sum() function. This function sums specified columns in an array and returns the sum. The following is a sample code:

$score = array(
    array('name' => '小明', 'math' => 80, 'chinese' => 90),
    array('name' => '小红', 'math' => 85, 'chinese' => 95),
    array('name' => '小刚', 'math' => 90, 'chinese' => 85),
);

$math_sum = array_sum(array_column($score, 'math'));
$chinese_sum = array_sum(array_column($score, 'chinese'));

echo '数学总分：' . $math_sum . '<br>';
echo '语文总分：' . $chinese_sum . '<br>';

In the above code, $score is a two-dimensional array that contains information about three students. We use the array_column() function to extract the specified column in the array, and then use the array_sum() function to sum the column. Finally, the total scores for mathematics and Chinese are output respectively.

It should be noted that when using the array column sum function, you need to ensure that the corresponding column exists and is numeric. Otherwise, a warning or error message will be returned.

In addition to the array column summation function, there are many practical array functions in PHP, such as array_merge(), array_filter(), array_map(), etc. These functions can greatly improve development efficiency and allow PHP developers to better handle array data.

In general, the array column sum function in PHP is very practical. It can easily calculate the sum of specified columns in an array. During the development process, we should make full use of this function to improve code efficiency and reduce development difficulty.

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