PHP: ¿Cómo puedo mostrar en un formulario select valores de un directorio?

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Código PHP:

<?php
$content .=  "</br>";
$content .=  "<center>";
$content .=  "<form action=\"skins.php\" method=\"post\">";
$content .=  "<select name=\"skins\">";
$handle=opendir('skins');
while ($file = readdir($handle)) {
    if ( (!ereg("[.]",$file)) ) {
            $themelist .= "$file ";
    }
}
closedir($handle);
$themelist = explode(" ", $themelist);
sort($themelist);
for ($i=0; $i < sizeof($themelist); $i++) {
        if($themelist[$i]!="") {
            $content .=  "<option value=\"$themelist[$i]\" ";
        if((($userinfo[theme]=="") && ($themelist[$i]=="$Default_Theme")) || ($userinfo[theme]==$themelist[$i])) $content .=  "selected";
        $content .=  ">$themelist[$i]\n";
 
    }}
$content .=  "</option>";
$content .=  "</select>";    
$content .=  "</br>";
$content .=  "</br>";
$content .=  "<input type=\"submit\" value=\"Cambiar\">";
$content .=  "</form>";
echo $content
?> 

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--Zsamer 16 Ene 2005