Sum of Digits

To find sum of digits of a number just add all the digits.

For example,

1. 14597 = 1 + 4 + 5 + 9 + 7  
2. 14597 = 26  

Logic:

• Take the number.
• Divide the number by 10.
• Add the remainder to a variable.
• Repeat the process until remainder is 0.

Example:

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Given program shows the sum of digits of 14597.

1. <?php  
2. $num = 14597;  
3. $sum=0; $rem=0;  
4.   for ($i =0; $i<=strlen($num);$i++)  
5.  {  
6.   $rem=$num%10;  
7.    $sum = $sum + $rem;  
8.    $num=$num/10;  
9.   }  
10.  echo "Sum of digits 14597 is $sum";  
11.  ?>  

Output: