Finding Even or Odd numbers with PHP

5 ways to check if an integer is even or odd. PHP does not provide any mathematical function like is_even to help you check if a given integer is an Even number or Odd. Writing your own such function is not difficult and below are listed a number of alternatives that provide different logical solutions to do this.

    function is_even( $int ) {
        return !( ( ( int ) $int ) & 1 );
    }