Dinamic css design

[arnage]

algorithm:

$css = isset($_GET['css']) ? trim($_GET['css']) : '';

$thecss = array('one', 'two', 'tree', 'four'); // Just letter names

if (!isset($css) || empty($css)) {
$css = 'one';
}
elseif (isset($css) && array_key_exists($css, $thecss)) {
$css = $thecss[$css];
} else {
if (!empty($css) && !in_array($css, $csses)) { exit; }
} 

interface:

<form method="get" action="./index.php">
<p>
<select name="css">
<option value="one">one</option>
<option value="two">two</option>
<option value="tree">tree</option>
<option value="four">four</option>
</select>
<input type="submit" value="Ok"/>
</p>
</form>

usage:

<link rel="stylesheet" type="text/css" href="./folder/'.$css.'.css"/>

[GumSlone]

you could do the php part like this,

$css = isset($_GET['css']) ? trim($_GET['css']) : ''; 
$thecss = array('one', 'two', 'tree', 'four'); // Just letter names
if (in_array($css, $thecss)==false) {
    $css = 'one';
} 

[arnage]

Well i guess that elegant code comes with the experience. Maybe im too obsessed with checking...