Determine if a number is even or odd in php

Question

hi,
working on a site that uses php and mysql. on one page, i
pull data from a database and put it into a table. the data is
about scientific papers so i have the following fields: id (unique
to each row), title, author, type, content (contains url to the pdf
file), and size. when i run it, the background of the whole table
is white. i want it so that each row of the table alternates
between having a light grey and a white background. i was thinking
about looking into my loop to see if the variable $i is even or
odd. using an if statement if $i is even, background is grey, if $i
is odd, the background is white. how do i do this, and am i on the
right track or is there an easier way to do this? below is the
code. im new to php and mysql. Thanks!!

Answer 1

use de modulus operator:
($i % 2) = 0 --> even
($i % 2) = 1 --> odd
jmack159 wrote:
> hi,
>
> working on a site that uses php and mysql. on one page,
i pull data from a
> database and put it into a table. the data is about
scientific papers so i have
> the following fields: id (unique to each row), title,
author, type, content
> (contains url to the pdf file), and size. when i run it,
the background of the
> whole table is white. i want it so that each row of the
table alternates
> between having a light grey and a white background. i
was thinking about
> looking into my loop to see if the variable $i is even
or odd. using an if
> statement if $i is even, background is grey, if $i is
odd, the background is
> white. how do i do this, and am i on the right track or
is there an easier way
> to do this? below is the code. im new to php and mysql.
Thanks!!
>
> <table border="0" cellspacing="2" cellpadding="2">
> <tr>
> <th></th>
> <th>Title</th>
> <th>Author</th>
> <th>Size</th>
> </tr>
> <?
> $username="username";
> $password="password";
> $database="database";
>
> mysql_connect(localhost,$username,$password);
> @mysql_select_db($database) or die( "Unable to select
database");
>
> $query="SELECT * FROM paper";
> $result=mysql_query($query);
> $num=mysql_numrows($result);
>
> $i=0;
> while ($i < $num) {
> $title=mysql_result($result,$i,"title");
> $author=mysql_result($result, $i, "author");
> $content=mysql_result($result, $i, "content");
> $type=mysql_result($result, $i, "type");
> $size=mysql_result($result, $i, "size");
> ?>
>
> <tr>
> <td><a href="<? echo "$content";
?>"><img src="images/icon_pdf.gif"
> alt="download pdf" /></a></td>
> <td><a href="<? echo "$content";
?>"><? echo "$title"; ?></a></td>
> <td><a href="<? echo "$content";
?>"><? echo "$author"; ?></a></td>
> <td><? echo "$size"; ?></td>
> </tr>
>
> <?
> $i++;
> }
>
> mysql_close();
> ?>
>
> </table>
>