如何使用for循环使用php对数字求和？

Question

I am learning PHP. Can someone help me understand how to sum numbers?

For example, I want to use a for loop to sum all numbers from 1 to 10:

        '1+2+3+4+5+6+7+8+9+10=?' 

Answer 1

Since you specifically said for loop:

<?php

$start = 1;
$end = 10;

$sum = 0;
for ($i = $start; $i <= $end; $i++) {
    $sum += $i;
}

echo "Sum from " . $start . " to " . $end . " = " . $sum;