# PHP program to check if a number is prime or not

To check if a number is prime or not, the code is as follows −

## Example

Live Demo

<?php
function check_prime($num) { if ($num == 1)
return 0;
for ($i = 2;$i <= $num/2;$i++)
{
if ($num %$i == 0)
return 0;
}
return 1;
}
$num = 47;$flag_val = check_prime($num); if ($flag_val == 1)
echo "It is a prime number";
else
echo "It is a non-prime number"
?>

## Output

It is a prime number

A function named ‘check_prime’ is used to check if the number is prime or not. A number that needs to be checked for being prime is passed as a parameter to the function. The number is defined and this function is called by passing the number as parameter. Relevant message is displayed on the console.