Sum of First N Natural Number in PHP

Given a number N, the task is to find the sum of the first N natural numbers in PHP.

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Examples:

Input: N = 5
Output: 15
Explanation: We will Add the Numbers till N 
 i.e. 1 + 2 + 3 + 4 + 5 = 15
Input: N = 10
Output: 55

There are different methods to find the sum of first N natural numbers, these are:

Using for Loop

We will iterate a loop from 1 to N and add all elements to get the sum of first N natural numbers.

Example:

Sum of first 5 Natural Numbers : 15

Using Mathematical Formulae

The mathematical formula to find the sum of first N natural number is N * (N + 1) / 2.

Example:

Sum of first 5 Natural Numbers : 15