Image with GD...

gistfile1.php

<?php
class Image {
	private $img;
	private $text;
	private $fontsize;

	public function __construct( $img, $text, $fontsize ) {
		$this->img = $img;
		$this->text = $text;
		$this->fontsize = $fontsize; 
	} 

	public function create() {
		if ( !empty( $this->img ) ) {
			$this->img = imagecreatefromjpeg( $this->img );
			$red = imagecolorallocate( $this->img, 255, 0, 0 );
			$green = imagecolorallocate( $this->img, 0, 255, 0 );
			$width = imagesx( $this->img );
			$height = imagesy( $this->img );
			$pos = ( $width - imagefontwidth( $this->fontsize ) * STRLEN( $this->text ) );
			imagestring( $this->img, $this->fontsize, $pos, $height-18, $this->text, $red );
			header( 'Content-type: image/jpeg' );
			imagejpeg( $this->img );
			imagedestroy( $this->img );
		} else {
			throw new Exception( 'Unable to load Image...' );
		}
	}
}