Problem with implenting Uploadify with WordPress

your uploadify.php is all inside a comment so its not really saving the file.

change it with this:

<?php
if (!empty($_FILES)) {
    $tempFile = $_FILES['Filedata']['tmp_name'];
    $targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . "https://wordpress.stackexchange.com/";
    $targetFile =  str_replace('//',"https://wordpress.stackexchange.com/",$targetPath) . $_FILES['Filedata']['name'];

    $fileTypes  = str_replace('*.','',$_REQUEST['fileext']);
    $fileTypes  = str_replace(';','|',$fileTypes);
    $typesArray = split('\|',$fileTypes);
    $fileParts  = pathinfo($_FILES['Filedata']['name']);

    if (in_array($fileParts['extension'],$typesArray)) {
        // Uncomment the following line if you want to make the directory if it doesn't exist
        // mkdir(str_replace('//',"https://wordpress.stackexchange.com/",$targetPath), 0755, true);

        move_uploaded_file($tempFile,$targetFile);
        echo str_replace($_SERVER['DOCUMENT_ROOT'],'',$targetFile);
    } else {
        echo 'Invalid file type.';
    }
}
?>

and also make sure you validate the file type because i had a site hacked after a hacker uploaded a php shell script with uploadify.