The quicker way to test odd or even
March 27th, 2007 by William YangThe mathmatically way
Explaination: We all know an even number is multiple of twos, and odd numbers are not. is_float is a PHP function test if $number divided by 2 is a whole number or not.
Using bitwise operator
Explaination: In PHP & or AND is a bitwise operator. When used it performs bitwise operation between two numbers. In the following example, the operator will test if the last bit of $number is 1. Thus successfully tests if $number is even or odd.
Conclusion:: Use bitwise operator to test an number is odd or even is much faster than using the division method. More detailed instruction can be found here.
