Question

How to calculate the sum of first N natural numbers in PHP

Answer 1

// 1 + 2 + 3 + 4 + ... + N

$n = 10;
$sum = 0;
 
while ($n > 0)
{
    $sum += $n;
    $n--;
}
         
echo "The sum is: " . $sum;

    
   
/*
run: 

The sum is: 55 
 
*/

 

70+ SQL courses for beginners and professionals

Answer 2

// 1 + 2 + 3 + 4 + ... + N

$n = 10;
$sum = 0;
 
$sum = $n / 2 * ($n + 1);
         
echo "The sum is: " . $sum;

    
   
/*
run: 

The sum is: 55 
 
*/

 

70+ SQL courses for beginners and professionals