php类库给现有的图片加文字水印，代码不是很完善，欢迎大家多多指教！代码如下：

img(图片路径,水印文字,字体路径,字体大小,字体角度);

比如：$tpl->img('abc.jpg','这是水印文字','ziti.ttf',30,0)

*/

class image_fu{

private $image;

private $img_info;

private $img_width;

private $img_height;

private $img_im;

private $img_text;

private $img_ttf='';

private $img_new;

private $img_text_size;

private $img_jd;

function img($img='',$txt='',$ttf='',$size=12,$jiaodu=0){

if(isset($img)&&file_exists($img)){//检测图片是否存在

$this->image =$img;

$this->img_text=$txt;

$this->img_text_size=$size;

$this->img_jd=$jiaodu;

if(file_exists($ttf)){

$this->img_ttf=$ttf;

}else{

exit('字体文件：'.$ttf.'不存在！');

}

$this->imgyesno();

}else{

exit('图片文件:'.$img.'不存在');

}

}

private function imgyesno(){

$this->img_info =getimagesize($this->image);

$this->img_width =$this->img_info[0];//图片宽

$this->img_height=$this->img_info[1];//图片高

//检测图片类型

switch($this->img_info[2]){

case 1:$this->img_im = imagecreatefromgif($this->image);break;

case 2:$this->img_im = imagecreatefromjpeg($this->image);break;

case 3:$this->img_im = imagecreatefrompng($this->image);break;

default:exit('图片格式不支持水印');

}

$this->img_text();

}

private function img_text(){

imagealphablending($this->img_im,true);

//设定颜色

$color=imagecolorallocate($this->img_im,rand(0,255),rand(0,255),rand(0,255));

$txt_height=$this->img_text_size;

$txt_jiaodu=$this->img_jd;

$ttf_im=imagettfbbox($txt_height,$txt_jiaodu,$this->img_ttf,$this->img_text);

$w = $ttf_im[2] - $ttf_im[6];

$h = $ttf_im[3] - $ttf_im[7];

//$w = $ttf_im[7];

//$h = $ttf_im[8];

unset($ttf_im);

$txt_y =$this->img_height-$h;

$txt_x =$this->img_width-$w;

//$txt_y =0;

//$txt_x =0;

$this->img_new=@imagettftext($this->img_im,$txt_height,$txt_jiaodu,$txt_x,$txt_y,$color,$this->img_ttf,$this->img_text);

@unlink($this->image);//删除图片

switch($this->img_info[2]) {//取得背景图片的格式

case 1:imagegif($this->img_im,$this->image);break;

case 2:imagejpeg($this->img_im,$this->image);break;

case 3:imagepng($this->img_im,$this->image);break;

default: exit('水印图片失败');

}

}

//显示图片

function img_show(){echo '

';}

//释放内存

private function img_nothing(){

unset($this->img_info);

imagedestroy($this->img_im);

}

}

?>

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