PHP code to generate text png images_PHP tutorial

/*
php generates text png images, you can use the following method Calling function:
http://www.yourdomian.com/text_png.php3?msg=helloworld+class&rot=15&size=48&font=fonts/ARIAL.TTF
*/
Header("Content-type: image/png");
class textPNG {
var $font = 'fonts/TIMES.TTF'; //Default font. Relative path to the script storage directory.
var $msg = "undefined "; // Default text.
var $size = 24;
var $rot = 0; // Rotation angle.
var $pad = 0; // Padding.
var $transparent = 1; // Text transparency.
var $red = 0; // On a black background...
var $grn = 0;
var $blu = 0;
var $bg_red = 255; // Set the text to white.
var $bg_grn = 255;
var $bg_blu = 255;
function draw() {
$width = 0;
$height = 0;
$offset_x = 0;
$offset_y = 0;
$bounds = array();
$image = "";
// Determine the text height.
$ bounds = ImageTTFBBox($this->size, $this->rot, $this->font, "W");
if ($this->rot < 0) {
$ font_height = abs($bounds[7]-$bounds[1]);
} else if ($this->rot > 0) {
$font_height = abs($bounds[1]-$ bounds[7]);
} else {
$font_height = abs($bounds[7]-$bounds[1]);
}
// Determine the border height.
$ bounds = ImageTTFBBox($this->size, $this->rot, $this->font, $this->msg);
if ($this->rot < 0) {
$width = abs($bounds[4]-$bounds[0]);
$height = abs($bounds[3]-$bounds[7]);
$offset_y = $font_height;
$offset_x = 0;
} else if ($this->rot > 0) {
$width = abs($bounds[2]-$bounds[6]);
$height = abs($bounds[1]-$bounds[5]);
$offset_y = abs($bounds[7]-$bounds[5])+$font_height;
$offset_x = abs( $bounds[0]-$bounds[6]);
} else {
$width = abs($bounds[4]-$bounds[6]);
$height = abs($bounds [7]-$bounds[1]);
$offset_y = $font_height;;
$offset_x = 0;
}
$image = imagecreate($width+($this->pad *2)+1,$height+($this->pad*2)+1);
$background = ImageColorAllocate($image, $this->bg_red, $this->bg_grn, $this- >bg_blu);
$foreground = ImageColorAllocate($image, $this->red, $this->grn, $this->blu);
if ($this->transparent) ImageColorTransparent($image, $background);
ImageInterlace($image, false);
// Draw a picture.
ImageTTFText($image, $this->size, $this->rot, $ offset_x+$this->pad, $offset_y+$this->pad, $foreground, $this->font, $this->msg);
// Output in png format.
imagePNG( $image);
}
}
$text = new textPNG;
if (isset($msg)) $text->msg = $msg; // Text to be displayed
if (isset($font)) $text->font = $font; // Font
if (isset($size)) $text->size = $size; // Text size
if (isset($rot)) $text->rot = $rot; // rotation angle
if (isset($pad)) $text->pad = $pad; // padding
if (isset($red)) $text->red = $red; // Text color
if (isset($grn)) $text->grn = $grn; // ..
if (isset($blu)) $text->blu = $blu; // ..
if (isset($bg_red)) $text->bg_red = $bg_red; // Background color.
if (isset($bg_grn)) $text->bg_grn = $bg_grn; // ..
if (isset($bg_blu)) $text->bg_blu = $bg_blu; // ..
if (isset($tr)) $text->transparent = $tr; // Transparency (boolean).
$text->draw();
?>