Determining A Number As Odd Or Even In Php

[Dman8568]

I'm developing a Calendar of Events for a friend's site, and came across a roadblock.

 

What I'm wanting the script to do is loop thought the Events (loaded from a Database), and for every even record output a background color. So the resulting list will be:

 

Non-Color

Color

Non-Color

Color

 

 

Here is how I have coded so far:

># $Events is where the Database was loaded into
# $i is the row number
# $row is the row's data
# $RETURN is the code that will be returned out of the function
# Please Note: I have not debugged this yet, so there are probably errors

 foreach($Events as $i => $row){
  $RETURN.= "<TR>\n";
  $RETURN.= " <TD>\n";
  $RETURN.= "  <strong>".$row[event]."</strong><br>\n";
  if (date("F", $row['start']) != date("F", $row['end'])  // Different Months
$RETURN.= "  <em><font size=1>".date("l j, Y", $row['start'])." - ".date("l j, Y", $row['end'])." <br> ".$row[location]."</font></em>\n";
  }	  
  elseif (date("d", $row['start']) != date("d", $row['end'])  // Different Days
$RETURN.= "  <em><font size=1>".date("l j".date("-j", $row['end']).", Y", $row[start])." <br> ".$row[location]."</font></em>\n";
  }	
  else
$RETURN.= "  <em><font size=1>".date("l j, Y", $row[start])." <br> ".$row[location]."</font></em>\n";
  }
 }

 

 

Is there any easy way to determine if $i is even or odd?

[TCH-Bruce]

You can set a variable just before your loop such as

 

>$odd = '-odd';

 

Then within your loop you can add

 

>if("-odd" == $odd) $odd = "";
		else $odd="-odd";

 

If $i is odd $odd will have a value of "-odd" if even it will be empty.

 

Hope that helps.

[nortk]

In general, you can determine whether a variable is even or odd using the modulus operator:

 

$i % 2

 

will have a value of 0 if $i is even, and 1 if $i is odd.

[TCH-Don]

How about using the modulus operator %

 

// if i% divided by 2 has no remainder, then i$ is even

if ( i$ % 2 )

{ $background_color = white }

else

{ $background_color = gray }

 

 

Guess I am slow today

Edited June 27, 2006 by TCH-Don

[TCH-Bruce]

There you go, multiple solutions for you.

[Dman8568]

WOW!

 

Thanks for all the responses.

 

I now have the function up-and-running.

 

 

(By the way, did I mention that: )

 

 

Thanks again