YA: Form Upload Processing Basics

<?php
/*
    Response Script for question: http://answers.yahoo.com/question/?qid=20110628154908AABkmr6
*/

$siteLive = false; // Determines which messages to display.
if($siteLive){
    // Upload Errors ** NOTE ** There is no error number 5. It was an old error, removed.
    $uploadErrors = array(
        1 => 'The Selected File, exceeds the maximum file size allowed. Please alter the file, or select an alternate.',
        2 => 'The Selected File, exceeds the maximum file size allowed. Please alter the file, or select an alternate.',
        3 => 'Your upload connection was dis-connected. Please try again.',
        4 => 'Please Select A File To Upload.',
        6 => 'Internal Server Error. Please try again later. If the problem persists, please inform the site administrator.', // Internal Operations Error
        7 => 'Internal Server Error. Please try again. If the problem persists, please inform the site administrator.', // Internal Server Error
        8 => 'Internal Server Error. Please try again. If the problem persists, please inform the site administrator.' // PHP Extension Library stopped the upload.
    );
}else{
    // Upload Errors ** NOTE ** There is no error number 5. It was an old error, removed.
    $uploadErrors = array(
        1 => 'The uploaded file exceeds the Server\'s Maximum Allowable File Size', // Both the server and form have max file size limitations
        2 => 'The uploaded file exceeds the Form\'s Maximum Allowable File Size.',
        3 => 'The uploaded file was only partially uploaded, then interrupted or the connection was dropped.',
        4 => 'No file was uploaded.', // No file was selected for upload.
        6 => 'Missing a temporary folder. The server requires a temporary folder for file uploads.', // Internal Operations Error
        7 => 'Failed to write file to disk.', // Internal Server Error
        8 => 'A PHP extension stopped the file upload.' // PHP Extension Library stopped the upload.
    );
}

if($_SERVER['REQUEST_METHOD'] === "POST"){
    $_fup = $_FILES['uploaded'];
    if($_fup['error'] === UPLOAD_ERR_OK){
        $upDir = "uploads";
        if(!is_dir($upDir)){
            mkdir($upDir, 0777, true);
        }
        $target_path = $upDir . DIRECTORY_SEPARATOR . basename($_fup['name']);
        if(move_uploaded_file($_fup['tmp_name'], $target_path)) {
            echo "The file " . basename($_fup['name']) . " has been uploaded";
        } else{
            echo "There was an error uploading the file, please try again!";
        }
    }else{
        echo $uploadErrors[$_fup['error']] . '<br >';
    }
}
?>
<form id="form1" name="form1" enctype="multipart/form-data" action="" method="POST">
Please choose a file:
<input type="hidden" name="MAX_FILE_SIZE" value="200000" />
<input name="uploaded" type="file" />
<input type="submit" value="Upload" />
</form>