php图片添加文字水印实现代码，

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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