Just paste this code within the class attribute of your element and voila!

<?php echo (++$j % 2 == 0) ? 'even' : 'odd'; ?>

Easy as pie: http://bavotasan.com/2010/display-rss-feed-with-php/

<?
// 301 Redirect - if url contains www then redirect to non-www
$current_path = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

if ( strpos($current_path,'www.') !== false ) {
	$current_path = str_replace('www.','',$current_path);
	header( "HTTP/1.1 301 Moved Permanently" );
	header( "Location: $current_path" );
}
?> 

<?php
function getFileextension($file) {
       return end(explode(".", $file));
}
?>

Source: http://css-tricks.com/snippets/php/find-file-extension/

1. Create a text file (in this case we’ll name it test.txt)
2. Make it writable (permissions: 0777)
3. PHP Code:

<?php

function writeToFile(){

  // 'w' overwrites entire file whereas 'a' appends text to it

  $filename = 'test.txt';
  if (is_writable($filename)) {                                                            
    $Handle = fopen($filename, 'a');
    $Data = "line 1\n".
    "line 2"; 
    fwrite($Handle, $Data); 
    print "Data Written"; 
    fclose($Handle);
  }
  else {
    echo "It's not writable!";
  }

}

?>

4. Now call your function wherever you want:

   <?php writeToFile(); ?>