The compiled code

<?php
/**
 * Class for converting Text to Image.
 * Font type can be specified
 * The alignment where the text will echo can also be set.
 *
 * @compiled Subesh Pokhrel from PHP.net and PHPclasses.org
 *
 */
define("ALIGN_LEFT", "left");
define("ALIGN_CENTER", "center");
define("ALIGN_RIGHT", "right");

class TextToImage {

	private $im;

	/**
	 * @name 				   : makeImageF
	 *
	 * Function for create image from text with selected font.
	 *
	 * @param String $text     : String to convert into the Image.
	 * @param String $font     : Font name of the text.
	 * @param int    $W        : Width of the Image.
	 * @param int    $H        : Hight of the Image.
	 * @param int	 $X        : x-coordinate of the text into the image.
	 * @param int    $Y        : y-coordinate of the text into the image.
	 * @param int    $fsize    : Font size of text.
	 * @param array  $color	   : RGB color array for text color.
	 * @param array  $bgcolor  : RGB color array for background.
	 *
	 */
	public function makeImageF($text, $font="CENTURY.TTF", $W=800, $H=200, $X=0, $Y=0, $fsize=18, $color=array(0x0,0x0,0x0), $bgcolor=array(0xFF,0xFF,0xFF)){

		$this->im = @imagecreate($W, $H)
		or die("Cannot Initialize new GD image stream");

		$background_color = imagecolorallocate($this->im, $bgcolor[0], $bgcolor[1], $bgcolor[2]);		//RGB color background.
		$text_color = imagecolorallocate($this->im, $color[0], $color[1], $color[2]);			//RGB color text.

		$this->imagettftextbox($this->im, $fsize,0, $X,$Y, $text_color, $font, $text,800);
	}

	/**
	* This function works to set alignment in image and write image.
	*/
	public function imagettftextbox(&$image, $size, $angle, $left, $top, $color, $font, $text, $max_width)
	{
		$text_lines = explode("\n", $text); // Supports manual line breaks!

		$lines = array();
		$line_widths = array();

		$largest_line_height = 0;

		foreach($text_lines as $block)
		{
			$current_line = ''; // Reset current line
			$align=ALIGN_CENTER; // Setting Alignment
			$words = explode(' ', $block); // Split the text into an array of single words

			$first_word = TRUE;

			$last_width = 0;

			for($i = 0; $i < count($words); $i++)
			{
				$item = $words[$i];
				$dimensions = imagettfbbox($size, $angle, $font, $current_line . ($first_word ? '' : ' ') . $item);
				$line_width = $dimensions[2] - $dimensions[0];
				$line_height = $dimensions[1] - $dimensions[7];

				if($line_height > $largest_line_height) $largest_line_height = $line_height;

				if($line_width > $max_width && !$first_word)
				{
					$lines[] = $current_line;

					$line_widths[] = $last_width ? $last_width : $line_width;

					/*if($i == count($words))
					 {
					 continue;
					 }*/

					$current_line = $item;
				}
				else
				{
					$current_line .= ($first_word ? '' : ' ') . $item;
				}

				if($i == count($words) - 1)
				{
					$lines[] = $current_line;

					$line_widths[] = $line_width;
				}

				$last_width = $line_width;

				$first_word = FALSE;
			}

			if($current_line)
			{
				$current_line = $item;
			}
		}

		$i = 0;
		foreach($lines as $line)
		{
			if($align == ALIGN_CENTER)
			{
				$left_offset = ($max_width - $line_widths[$i]) / 2;
			}
			elseif($align == ALIGN_RIGHT)
			{
				$left_offset = ($max_width - $line_widths[$i]);
			}
			imagettftext($image, $size, $angle, $left + $left_offset, $top + $largest_line_height + ($largest_line_height * $i), $color, $font, $line);
			$i++;
		}

		return $largest_line_height * count($lines);
	}

	/**
	 * @name showAsPng
	 *
	 * Function to show text as Png image.
	 *
	 */
	public function showAsPng(){

		header("Content-type: image/png");
		return imagepng($this->im);
	}

}
?>

Save this file as TextToImage.class.php.

And then use this code to call the classes instance.

<?php
/** Downloaded from PHP classes
* Please note that KORONG.TTF font file should be present to run the code.
*/

ini_set("display_errors",1);
require_once('TextToImage.class.php');
$_im = new TextToImage();
$_im->makeImageF("Thank you ! Subesh Pokhrel \n subesh.com.np","KORONG.TTF");
$_im->showAsPng();
?>

Cheers!