How to find the sum of squares of array elements in php

Method: 1. Use "$s=0;" to define a variable to store the calculation result; 2. Use "foreach($arr as $v){}" to loop through the array; 3. In the loop body , use pow() to calculate the square value of the array elements, and use the "=" operator to add them together, the syntax is "$s =pow($v,2);".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php seeks array elements Method of sum of squares

In PHP, you can use the foreach statement, pow() function and "=" operator to find the sum of squares of array elements.

1. Define a variable assigned a value of 0 to store the calculation results.

$s=0;

2. Use the foreach statement to loop through the array

Syntax:

foreach ($array as $value){
    语句块;
}

• Traverse to A certain $array array, and assign the value of the current array to $value in each loop.

3. In the loop body, calculate the sum of the squares of the array elements

Use pow() to calculate the square of the elements, and use "=" to square the Just add the values.

Implementation code:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,2,3,4,5);
var_dump($arr);
$s=0;
foreach($arr as $v){
	$s+=pow($v,2);
}
echo "数组元素的平方和为：".$s;
?>

We use a calculator to calculate:

ok, that’s correct.

Description:

The pow() function can calculate and return x raised to the yth power. If you want to ask for the bisector of a number, set y to 2; for cubes, set y to 3....

"=" is an assignment operation, which will change the variable on the left side of the operator Add the value of the expression on the right and assign it to the variable on the left.

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