How PHP arrays perform common mathematical operations

How PHP arrays perform common mathematical operations

Abstract: PHP is a widely used server-side scripting language that is widely used in website development. Arrays in PHP are a very useful data structure that can easily store and manipulate multiple values. This article explains how to use PHP arrays to perform common mathematical operations and provides code examples.

1. Addition operation
In PHP, you can use the " " operator to perform array addition operations. For example, if there are two arrays $arr1 and $arr2, we can add them like this:

$arr1 = [1, 2, 3];
$arr2 = [4, 5, 6];
$result = $arr1 + $arr2;
print_r($result);

The above code will output:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 6
    [4] => 7
    [5] => 8
)

As you can see, the addition operation will The arrays are merged into a new array, and the index key values ​​of the original array are retained.

2. Subtraction operation
Similar to addition operation, you can also use the "-" operator to perform array subtraction operation in PHP. For example, if there are two arrays $arr1 and $arr2, we can use the following code to perform subtraction:

$arr1 = [1, 2, 3];
$arr2 = [2, 3];
$result = array_diff($arr1, $arr2);
print_r($result);

The above code will output:

Array
(
    [0] => 1
)

As you can see, the subtraction operation will start from Removes the same elements from the first array as the second array and returns a new array.

3. Multiplication operation
In PHP, you can use the "*" operator to perform array multiplication operations. For example, if there is an array $arr and a constant $num, we can use the following code to perform multiplication:

$arr = [1, 2, 3];
$num = 2;
foreach ($arr as &$value) {
    $value *= $num;
}
unset($value);
print_r($arr);

The above code will output:

Array
(
    [0] => 2
    [1] => 4
    [2] => 6
)

As you can see, the multiplication operation will Each element in the array is multiplied by a constant and the original array is updated.

4. Division operation
In PHP, you can use the "/" operator to perform array division operation. For example, if there is an array $arr and a constant $num, we can use the following code to perform division:

$arr = [2, 4, 6];
$num = 2;
foreach ($arr as &$value) {
    $value /= $num;
}
unset($value);
print_r($arr);

The above code will output:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

As you can see, the division operation will Divide each element in the array by a constant and update the original array.

To sum up, PHP arrays can conveniently perform numerical operations through common mathematical operations such as addition, subtraction, multiplication and division. These operations can operate not only on the entire array, but also on each element of the array to meet a variety of different needs.

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