In this post, I will discuss **Sum Of Digit Of A Number Using Recursion Through PHP Programming**.

Given a number, we need to find sum of its digits using recursion.

**Examples:**

```
Input : 12345
Output : 15
Input : 45632
Output :20
```

Now, the step by step process for a better understanding of how this algorithm works,

Lets, Take the example **12345**

**Step-1:**

`12345 % 10 which is equal-too 5 + and then send 12345/10 to next step.`

**Step-2:**

`1234 % 10 which is equal-too 4 + and then send 1234/10 to next step.`

**Step-3:**

`123 % 10 which is equal-too 3 + and then send 123/10 to next step.`

**Step-4:**

`12 % 10 which is equal-too 2 + and then send 12/10 to next step.`

**Step-5:**

` 1 % 10 which is equal-too 1 and then send 1/10 to next step.`

**Step-6:**

` 0 algorithm stops.`

Here, following diagram will illustrate the process of recursion:

<?php // Recursive PHP program // to find sum of digits // of a number // Function to check sum of // digit using recursion function sum_of_digit($n) { if ($n == 0) return 0; return ($n % 10 + sum_of_digit($n / 10)); } // Driven Code $num = 12345; $result = sum_of_digit($num); echo("Sum of digits in " . $num . " is " . $result); // This code is contributed by Ajit. ?>

**Output**:

`Sum of digits in 12345 is 15`

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