Custom php code output to footer

[Defkalion]

I made it happen. Here is my code:

PHP Code:

function mymyLink(){

$modArray=array(
     0=>array('word1','/link1'),
     1=>array('word2','/link1'),
     2=>array('word3','/link1'),
     3=>array('word4','/link1'),
     4=>array('word5','/link1'),
     5=>array('word6','/link1'),
     6=>array('word7','/link2'),
     7=>array('word8','/link2'),
     8=>array('word9','/link2'),
     9=>array('word10','/link2'), );



$mod=strlen($_SERVER['REQUEST_URI']);

$modArr=$modArray[ $mod % count($modArray) ]; $modStr=$modArr[0]; $modLink=$modArr[1]; $extraLink="<a  style='font-size:9px;' 
href='http://domain.com$modLink'>$modStr</a>";

return $extraLink ;

}

$mymyCode=mymyLink() ; 


Now, I put that in a plugin in the global_start and then at my footer template I just call the variable $mymyCode.

Does that make sense? And even if it does, am I messing something up here? Is it server intensive for example ?