Filter array of filenames against an array of banned words and an array of banned file extensions

I am using PHP and I have an array of user images that I need to filter. I need to do 2 different filters:

1. Look in original array and see if each value contains a value in my "bad words" array
2. Look and see if the value in the original array ends in one of "bad extensions" values

Images Array:

Array  
(  
    [0] => smiles.gif  
    [1] => kittens.jpg  
    [2] => biscuits.png  
    [3] => butthead.jpg  
)  

$bad_words = array('beavis','butthead','winehouse');  
$bad_extensions = array('.gif','.tiff');  

I would like it to return:

Array  
(  
    [0] => kittens.jpg  
    [1] => biscuits.png  
)

$array = array("smiles.gif", "kittens.jpg", "biscuits.png", "butthead.jpg");

$new_arr = array_filter($array, "filter");

function filter($element) {
    $bad_words = array('beavis','butthead','winehouse');  
    $bad_extensions = array('gif','tiff');

    list($name, $extension) = explode(".", $element);
    if(in_array($name, $bad_words))
        return;

    if(in_array($extension, $bad_extensions))
        return;

    return $element;
}


echo "<pre>";
print_r($new_arr);
echo "</pre>";

Outputs

Array
(
    [1] => kittens.jpg
    [2] => biscuits.png
)

I removed the . from your extensions tho

edit: added wicked fleas correction