How to sum arrays in PHP based on specified conditions

Method: 1. Use "$sum=0;" to define a variable to store the summation result; 2. Use "foreach($arr as $v){}" to loop through the array; 3. In the loop body , use the if statement to set the conditional filter elements, and add the elements that meet the condition to sum. The syntax is "if (condition) {$sum =$v;}".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

The PHP array is specified according to Conditional summation

#Step 1: Define a variable assigned a value of 0 to store the summation result.

$sum=0;

Step 2: Use the foreach statement to loop through the array

foreach ($arr as $v){
    //循环体语句块;
}

Traverse the given $arr array, and in each loop, the current array will be The value is assigned to $v.

Step 3: In the loop body, use the if statement to set the conditional filter elements, and add and sum the elements that meet the conditions

if(条件){
$sum+=$v;
}

After the loop ends, $sum The value is the summation result.

Example: Add and sum even elements

Even elements are values ​​divisible by 2, see using$v%2==0Conditions to judge

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr = [1,2,3,4,5,6,7,8,9,10];
var_dump($arr);
$sum=0;
foreach($arr as $v){
	if($v%2==0){
		$sum+=$v;
	}
}
echo "数组偶数和为：".$sum;
?>

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