PHP限制文件类型上传

I'm trying to create a form that allows me to upload only html files to a web directory via php and then delete them after 24 hours of being on my server. Whenever I go to upload a file I just get a blank white page. Can somebody help me figure this out please? Many thanks!

<?php 
if (($_FILES["uploaded"]["type"] == "html")
{
    $target = "users/"; 
    $target = $target . basename( $_FILES['uploaded']['name']) ; 
    $ok=1; 

    echo "File: " . $_FILES["uploaded"]["name"] . "<br />";
    echo "Type: " . $_FILES["uploaded"]["type"] . "<br />";
    echo "Size: " . ($_FILES["uploaded"]["size"] / 1024) . " Kb<br />";
    echo "Location: users/" . $_FILES["uploaded"]["name"];

    $files=shell_exec('find /users/ -mmin +1440');
    $file = explode("
",$files);
    if(isset($file) && is_array($file))
    {
        foreach($file as $val)
        {
            @unlink($val);
        }
    }
}

else 
{
    echo "Sorry, " . $_FILES["uploaded"]["name"] . " is not a valid html document. Please try again.";
    unlink . $_FILES["uploaded"]["name"];
}
?> 

There is a missing parentheses closing first IF. Then at that last line unlink . $_FILES["uploaded"]["name"]; you probably mean unlink() Blank page makes me think you have error reporting off. Turn it on when you code :)

<?php 
if(($_FILES["uploaded"]["type"] == "html")){
    $target = "users/"; 
    $target = $target . basename( $_FILES['uploaded']['name']) ; 
    $ok=1; 

    echo "File: " . $_FILES["uploaded"]["name"] . "<br />";
    echo "Type: " . $_FILES["uploaded"]["type"] . "<br />";
    echo "Size: " . ($_FILES["uploaded"]["size"] / 1024) . " Kb<br />";
    echo "Location: users/" . $_FILES["uploaded"]["name"];

    $files=shell_exec('find /users/ -mmin +1440');
    $file = explode("
",$files);
    if(isset($file) && is_array($file))
    {
        foreach($file as $val)
        {
            @unlink($val);
        }
    }
}

else {
    echo "Sorry, " . $_FILES["uploaded"]["name"] . " is not a valid html document. Please try again.";
    unlink($_FILES["uploaded"]["name"]);
}
?>