Thumbnail create from Jpeg

function createThumbs( $pathToImages, $pathToThumbs, $thumbWidth ) {
        // load image and get image size
	$img = imagecreatefromjpeg( "{$pathToImages}" );
	$width = imagesx( $img );
	$height = imagesy( $img );
	// calculate thumbnail size
	$new_width = $thumbWidth;
	$new_height = floor( $height * ( $thumbWidth / $width ) );
	// create a new temporary image
	$tmp_img = imagecreatetruecolor( $new_width, $new_height );
	// copy and resize old image into new image
	imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
	// save thumbnail into a file
	imagejpeg( $tmp_img, "{$pathToThumbs}" );
}