## A Program To Find Prime Number in PHP

A Prime Number is a whole number greater than 1 , which can only be divided by itself and 1. Some prime numbers are : 3, 5, 7, 11 ,13,17, 19 and 23. These numbers can only be divided by 1 and itself. For example 7 can only be divided by 1 and 7 hence it is a prime number. But 8 can be divide by 4 , 2 , 1 and itself. So it is not a prime number its **composite number**.

### Algorithm to Write Prime Number in PHP

There are many algorithms to write prime number in PHP. Here I am writing a simple algorithm.

### Algorithm

- Create a function.
- Get number from user to check.
- Divide number by 2 and store it in a variable name it resultant variable or whatever you like.
- Run for loop up to resultant .
- Inside for loop divide number by loop integers and assign each remainder to a variable.
- If any remainder is equal to zero it is not prime
- Else it is a prime number.

### Write a Program To Find Prime Number in PHP

function prime() //Create a Function

{

$n=11; //Number to check

$a=$n/2;

for($i=2;$i<=$a;$i++)

{

$m=$n%$i;

}

if($m==0)

{

echo"is Not Prime";

} else

{

echo "Prime";

}

}

prime();