How to use for loop to find the sum of arrays in php

Implementation steps: 1. Use "array_values ​​(original array)" to convert the original array into an index array; 2. Use "count (index array)" to find the length of the index array; 3. Use "$sum= 0;" Define a variable to store the summation result; 4. Use the for statement to loop through the array, the syntax is "for($i=0;$i

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

php uses for loop Method for finding the sum of arrays

The for loop will pre-define the variable that controls the number of loops in the for statement, so the for loop statement can perform loop operations according to the known number of loops, and is suitable for Situations where you know exactly how many times the script needs to be run.

That is, the for statement traversal is related to the array subscript, and is suitable for traversing continuous index arrays.

Therefore, before using the for loop to find the sum of the arrays, the array needs to be converted into an index array.

Implementation steps:

Step 1: Use the array_values() function to convert the original array into an index array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(1=>1,"a"=>2,2=>3,"b"=>4,"c"=>5);
var_dump($arr);
$value=array_values($arr);
var_dump($value);
?>

Step 2: Use the count() function to find the length of the index array

$len=count($value);
echo "数组长度为：".$len;

Step 3: Definition A variable is assigned a value of 0 to store the summation result.

$sum=0;

Step 4: Use the for statement to loop through the array

for ($i=0; $i <数组长度;$i++) {
    循环体语句块;   
}

Step 5: In the loop body, use the "=" operator to Add the array elements one by one to find the sum

$sum+=$索引数组变量名[$i];

After the loop ends, the value of $sum is the array sum.

Sample code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(1=>1,"a"=>2,2=>3,"b"=>4,"c"=>5);
$value=array_values($arr);
var_dump($value);

$sum=0;
$len=count($value);
for ($i=0; $i<$len;$i++) {
    $sum+=$value[$i]; 
}
echo "数组总和为：".$sum;
?>

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to use for loop to find the sum of arrays in php. For more information, please follow other related articles on the PHP Chinese website!