Small PHP Problem!

<?php
$animalarray = array("cat", "dog", "beast", "lizard", "horse", "lion");
$random_animal = $animalarray[array_rand($animalarray)];
?>
<?php
echo "I recognize the $random_animal" ?>

<?php
$animalarray = array("cat", "dog", "beast", "lizard", "horse", "lion");
$random_animal = $animalarray[array_rand($animalarray)];

switch($random_animal){

case 'cat': 
$url= 'http://google.com';
break;

case 'dog':
$url= 'http://yahoo.com';
break;

//copy above 3 lines for each variable and change values.

default:
break;


} //end switch

?>

<?php
$animalarray = array("cat", "dog", "beast", "lizard", "horse", "lion");

//this will create $cat OR $dog... with value 'lorem ipsum'
${$animalarray[array_rand($animalarray)]) = 'lorem ipsum';
?>

<?php
$animalarray = array( 0=>"lion", 1=>"cat", 2=>"dog", 3=>"beast", 4=>"lizard", 5=>"horse");
$random=rand(0,count($animalarray)-1);
$random_animal = $animalarray[$random];
?>
<?php
echo "I recognize the $random_animal" ?>

<?php
$anymalarray[0]['animal']="tiger";
$anymalarray[0]['url']="http://google.com";
$anymalarray[1]['animal']="lion";
$anymalarray[1]['url']="http://internet.com";
$anymalarray[2]['animal']="poodle";
$anymalarray[2]['url']="http://chip.com";
$anymalarray[3]['animal']="cat";
$anymalarray[3]['url']="http://dog.com";
$random=rand(0,count($animalarray)-1);
$random_animal = $animalarray[$random]['animal'];
$random_url = $animalarray[$random]['url'];
?>
<?php
echo "$random_animal was picked, and the url is $random_url" ?>