PHP finds the average of a two-dimensional array

In PHP, we can use loop structures and variables to solve for the average value of a two-dimensional array. The specific implementation is as follows:

<?php
// 定义二维数组
$array = array(
    array(1, 2, 3),
    array(4, 5, 6),
    array(7, 8, 9)
);

// 统计行数和列数
$rows = count($array);
$cols = count($array[0]);

// 定义变量保存总和
$sum = 0;

// 循环计算总和
for ($i = 0; $i < $rows; $i++) {
    for ($j = 0; $j < $cols; $j++) {
        $sum += $array[$i][$j];
    }
}

// 计算平均值
$avg = $sum / ($rows * $cols);

// 输出结果
echo "二维数组的平均值为：" . $avg;
?>

In the above code, we first define a two-dimensional array $array, and use the count() function to count the number of rows and columns. Then in the loop, we use two variables $i and $j to iterate through all the elements and accumulate them into the $sum variable. Finally, divide the sum by the total number of elements to get the average value $avg.

It should be noted that if for some two-dimensional arrays, the number of rows and columns are not equal, the way of calculating the average will also be different. At this time, we can use the array_map() function to process arrays with different numbers of rows and columns.

I hope the above code can help you solve the average value problem of a two-dimensional array.

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