PHP Program to check if a number is Even or Odd

<?php
   //program to check EVEN or ODD
   //function: isEvenOrOdd
   //description: This function will check
   //whether a given number is EVEN or ODD
   function isEvenOrOdd($num){
        //if num is divisible by 2 than
        //it will be an EVEN number or it 
        //will be an ODD number
        if( $num % 2 == 0)
            return 1; //will check as EVEN number
        else
            return 0; //will check as ODD number
   }
   
   //main code to test the function
   $number = 12;
   if(isEvenOrODD($number))
        print_r($number." is EVEN number");
   else
        print_r($number." is ODD number");

    print_r("\n");
    
    //again check with an ODD number
   $number = 13;
   if(isEvenOrODD($number))
        print_r($number." is EVEN number");
   else
        print_r($number." is ODD number");    
?>

Output
12 is EVEN number
13 is ODD number