php - Modify Rename function and creation for image files

Question

This script generates two files, two images, and it renames them.

What i need is that the first image to have the name of the file uploaded, for example : test.jpg, because what this does is convert the image file name to test.jpg.JPG (please don't tell me to remove the part where the extension is added because if i do it it will no longer create the image file) and the second image generated i need it to be something like : test_s.jpg

function setFile($src = null) {
$this->ext = strtoupper(pathinfo($src, PATHINFO_EXTENSION));
if(is_file($src) && ($this->ext == "JPG" OR $this->ext == "JPEG")) {
$this->img_r = ImageCreateFromJPEG($src);
} elseif(is_file($src) && $this->ext == "PNG") {
$this->img_r = ImageCreateFromPNG($src);
} elseif(is_file($src) && $this->ext == "GIF") {
$this->img_r = ImageCreateFromGIF($src);
}
$this->img_w = imagesx($this->img_r);
$this->img_h = imagesy($this->img_r);
}


function createFile($output_filename = null) {
if($this->ext == "JPG" OR $this->ext == "JPEG") {
imageJPEG($this->dst_r, $this->uploaddir.$output_filename.'.'.$this->ext, $this->quality);
} elseif($this->ext == "PNG") {
imagePNG($this->dst_r, $this->uploaddir.$output_filename.'.'.$this->ext);
} elseif($this->ext == "GIF") {
imageGIF($this->dst_r, $this->uploaddir.$output_filename.'.'.$this->ext);
}
$this->output = $this->uploaddir.$output_filename.'.'.$this->ext;
}

function setUploadDir($dirname) {
$this->uploaddir = $dirname;
}

function flush() {
$tempFile = $_FILES['Filedata']['tmp_name'];
$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
$targetFile = str_replace('//','/',$targetPath) . $_FILES['Filedata']['name'];

imagedestroy($this->dst_r);
unlink($targetFile);
imagedestroy($this->img_r);

}

}

$tempFile = $_FILES['Filedata']['tmp_name'];
$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
$targetFile = str_replace('//','/',$targetPath) . $_FILES['Filedata']['name'];

move_uploaded_file ($tempFile, $targetFile);

 $image = new Image();
            $image->setFile($targetFile);
            $image->setUploadDir($targetPath);
            $image->resize(640);
            $image->createFile(md5($tempFile));
            $image->resize(100);
            $image->createFile($_FILES['Filedata']['name']);
            $image->flush();
}