How does this code block works?

Posted by Justin John on Stack Overflow See other posts from Stack Overflow or by Justin John
Published on 2012-12-15T04:50:37Z Indexed on 2012/12/15 5:03 UTC
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I can't understand how the following code works.

$start = 1;
while($start<10){
    if ($start&1) {
      echo "ODD  ".$start." <br/> ";
    }
    else {
      echo "EVEN  ".$start." <br/> ";
    }
    $start++;
}

The $start&1 will return ODD and EVEN seperately.

Output

ODD 1
EVEN 2
ODD 3
EVEN 4
ODD 5
EVEN 6
ODD 7
EVEN 8
ODD 9 

If we give $start&2 instead of $start&1, it returns with another order.

How &1 &2 etc... works here?

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