Even or odd number validation with PHP

The other day, while I was writing up some PHP code, I ran into a really cool way of identifying if a number is even or odd (refer to the link further down below). I needed it as I looped the creation of a couple of divs and wanted the odd numbered ones to be floated left, the evens to the right.

abolute position within div - a one liner

If you want to use absolute positioning within a div, you just have to set the parent div to relative.

You should put this in the head between the sytle tags:

Center div with margin: 0 auto - a one liner

The best and cleanest way to center a div is to use the margin: 0 auto attributes in styles. Make sure however that you set a width of the div to something specific otherwise it's not going to work.

Note: it seems that this unfortunately doesn't work in IE7. Alternatively you may use the <center> tag.

See an example of the style attribute below:
(click in the box to highlight the code for copy)#wrapper { width: 500px; margin: 0 auto; }