Example of adding watermark to php image

Example, PHP code to add watermark to images.

/*
//Example
$image = new Gimage();
$image->limit = 600;//Length and width limit
$image->wm_text=” www.linuxlaptop.cn”;//Watermark text
$image->wm_fontfile=”font/xsuni.ttf”;//Font file
$image->wm_color=”#ff0000″;
$image-> save_file = "ltcn.jpg";//Save to xx file
$image->create("linuxlaptop.jpg");//Create from xx file
*/
/*
+------ -----------------------
| Generate thumbnails & watermarked image classes
+-------------- ----------------
*/
Class Gimage{

var $input_type = ""; //Input image format
var $output_type = "jpg"; //Output Image format
var $limit = 0; // Image size limit
var $filename = ""; // Enter the file name of the image (can also be image data directly)
var $jpeg_quality = 90; // jpeg image quality
var $save_file = ''; //Output file name
var $wm_text = ""; //Watermark text (Chinese is not supported:'( )
var $wm_size = 12; //Watermark text size
var $wm_angle = 0; //Watermark text angle
var $wm_x = 30; //Watermark x coordinate
var $wm_y = 30; //Watermark y coordinate
var $wm_color = "#cccccc"; //Watermark color
var $wm_fontfile = "geodesic.ttf";//Watermark font file

function create($filename="")
{
if ($filename) $this->filename = $filename;

if (!$this-> input_type) $this->get_type();
if (!$this->output_type) $this->output_type = $this->input_type;

if ($this->input_type == "jpg ") $this->input_type = "jpeg";
if ($this->output_type == "jpg") $this->output_type = "jpeg";

switch ($this->input_type) {
 case 'gif':
 $src_img=ImageCreateFromGIF($this->filename);
 break;

 case 'jpeg':
 $src_img=ImageCreateFromJPEG($this->filename);
 break;

 case 'png':
 $src_img=ImageCreateFromPNG($this->filename);
 break;

 default:
 $src_img=ImageCreateFromString($this->filename);
 break;
}
$src_w=ImageSX ($src_img);
$src_h=ImageSY($src_img);
if ($src_w>=$src_h){
 if ($src_w>$this->limit){
 $new_w=$this->limit ;
 $new_h=($this->limit / $src_w)*$src_h;
 }
}
else{
 if ($src_h>$this->limit){
 $new_h=$this-> limit;
 $new_w=($this->limit / $src_h)*$src_w;
 }
}

if ($new_h){
 $dst_img=imagecreatetruecolor($new_w,$new_h);
 imagecopyresampled($ dst_img,$src_img,0,0,0,0,$new_w,$new_h,ImageSX($src_img),ImageSY($src_img));
}
else{
 $dst_img = $src_img;
}

if ( $this->wm_text)
{
 if(preg_match("/([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])([ a-f0-9][a-f0-9])/i", $this->wm_color, $color))
 {
 $red = hexdec($color[1]);
 $green = hexdec( $color[2]);
 $blue = hexdec($color[3]);
 }
 $wm_color = imagecolorallocatealpha($dst_img, $red, $green, $blue, 90);
 imagettftext($dst_img, $ this->wm_size, $this->wm_angle, $this->wm_x, $this->wm_y, $wm_color, $this->wm_fontfile, $this->wm_text);
}

if ($this->save_file)
{
 switch ($this->output_type){
 case 'gif':
 $src_img=ImagePNG($dst_img, $this->save_file);
 break;

 case 'jpeg':
 $src_img=ImageJPEG($dst_img, $this->save_file, $this->jpeg_quality);
 break;

 case 'png':
 $src_img=ImagePNG($dst_img, $this- >save_file);
 break;

 default:
 $src_img=ImageJPEG($dst_img, $this->save_file, $this->jpeg_quality);
 break;
 }
}
else
{
 header( "Content-type: image/{$this->output_type}");
 switch ($this->output_type){
 case 'gif':
 $src_img=ImagePNG($dst_img);
 break;

 case 'jpeg':
 $src_img=ImageJPEG($dst_img, "", $this->jpeg_quality);
 break;

 case 'png':
 $src_img=ImagePNG($dst_img);
 break;

 default:
 $src_img=ImageJPEG($dst_img, "", $this->jpeg_quality);
 break;
 }
}
imagedestroy($dst_img);

}
function get_type()//Get the image file type
{
$name_array = explode(".",$this->filename);
if (preg_match("/.(jpg|jpeg|gif|png)$/", $this->filename, $matches ))
{
 $this->input_type = strtolower($matches[1]);
}
else
{
 $this->input_type = "string";
}
}
}