Extract zip images and Upload

<?php

$supload = isset($_POST["supload"]) ? $_POST["supload"] : "";

if($supload != ""){
    $dir = "upload/"; //The folder to store your images
    $fileName = $_FILES['sfile']['name']; //get the file name
    $fileSize = $_FILES['sfile']['size']; //get the size
    $fileError = $_FILES['sfile']['error']; //get the error code
    if($fileSize > 0 || $fileError == 0){ //check if the file is corrupt or error
        //$fname = $dir.$fileName;
        $zip = zip_open($_FILES['sfile']['tmp_name']);
        if(is_resource($zip)){
            do_upload($dir,$_FILES['sfile']['tmp_name']);
        }
    }else{
        echo "error! ".$fileSize." ".$fileError;
    }
}

function do_upload($dir,$path){
    $allowed_type = array("jpeg","jpg","gif","png","bmp","pjpeg");
    $zip = new ZipArchive;
    if ($zip->open($path) === true) {
        for($i = 0; $i < $zip->numFiles; $i++) {
            $filename = $zip->getNameIndex($i);

            //Get file informatin eg: filename, file extension, etc..
            $fileinfo = pathinfo($filename);
            $fname = $dir.$fileinfo['basename'];

            //Only proceed if it has an extension
            if(isset($fileinfo['extension'])){
                //Check if the file extension is an image file
                if(in_array($fileinfo['extension'],$allowed_type)){
                    //Now extract the file
                    if(copy("zip://".$path."#".$filename, $fname)){
                        echo "File ".$filename." uploaded. ";
                        //Create new filename for thumbnail
                        $newfilename = "th_".$fileinfo['basename'];

                        //Second check, To get the real MIME type
                        $imgInfo = getimagesize($fname);
                        echo "File Type: ".$imgInfo['mime']."<br />";
                        if(checkFileType($imgInfo['mime'])){
                            //Now resize the image
                            resize($fname, $dir.$newfilename);
                        }
                    }
                }else{
                    echo $filename." is not an image!<br />";
                }
            }
        }
        $zip->close();
        return true;
    }
}

function checkFileType($file){
    $imgType = array(
            "Gif"=>"image/gif",
            "JPG" => "image/jpg",
            "JPEG" => "image/jpeg",
            "PJPEG" => "image/pjpeg",
            "PNG" => "image/png",
            "BMP" => "image/bmp");
    if(in_array($file,$imgType))
            return true;
    else return false;
}

function resize($img, $newfilename) {
    //Check if GD extension is loaded
    if (!extension_loaded('gd') && !extension_loaded('gd2')) {
        trigger_error("GD is not loaded", E_USER_WARNING);
        return false;
    }
    $w = 100;
    $h = 100;

    //Get Image size info
    $imgInfo = getimagesize($img);
    switch ($imgInfo[2]) {
        case 1: $im = imagecreatefromgif($img); break;
        case 2: $im = imagecreatefromjpeg($img);  break;
        case 3: $im = imagecreatefrompng($img); break;
        default:  trigger_error('Unsupported filetype!', E_USER_WARNING);  break;
    }

    //If image dimension is smaller, do not resize
    if ($imgInfo[0] <= $w && $imgInfo[1] <= $h) {
        $nHeight = $imgInfo[1];
        $nWidth = $imgInfo[0];
    }else{
        //resize it, but keep it proportional
        if ($w/$imgInfo[0] > $h/$imgInfo[1]) {
            $nWidth = $w;
            $nHeight = $imgInfo[1]*($w/$imgInfo[0]);
            }else{
            $nWidth = $imgInfo[0]*($h/$imgInfo[1]);
            $nHeight = $h;
        }
    }
    $nWidth = round($nWidth);
    $nHeight = round($nHeight);

    $newImg = imagecreatetruecolor($nWidth, $nHeight);

    /* Check if this image is PNG or GIF, then set if Transparent*/
    if(($imgInfo[2] == 1) OR ($imgInfo[2]==3)){
        imagealphablending($newImg, false);
        imagesavealpha($newImg,true);
        $transparent = imagecolorallocatealpha($newImg, 255, 255, 255, 127);
        imagefilledrectangle($newImg, 0, 0, $nWidth, $nHeight, $transparent);
    }
    imagecopyresampled($newImg, $im, 0, 0, 0, 0, $nWidth, $nHeight, $imgInfo[0], $imgInfo[1]);

    //Generate the file, and rename it to $newfilename
    switch ($imgInfo[2]) {
        case 1: imagegif($newImg,$newfilename); break;
        case 2: imagejpeg($newImg,$newfilename);  break;
        case 3: imagepng($newImg,$newfilename); break;
        default:  trigger_error('Failed resize image!', E_USER_WARNING);  break;
    }

    return $newfilename;
}
?>
<form name="fsupload" action="" method="post" enctype="multipart/form-data">
    <div>
    Add Image: <input type="file" name="sfile" id="sfile" />
    <input type="submit" name="supload" value="Upload" />
    </div>
</form>